Technical Need help decoding a small block Chevy engine

In the back of the engine it does say 5.7 but when I look up the number that's on the head it says the heads are from a 305 and here is a photo of the pad on the passenger side if you can help me decode this it would be great want to see if it's worth building this engine

 

look on the back top side block

Sent from my SM-J727R4 using The H.A.M.B. mobile app

 

Look at the driver's side, behind the head, on the bellhousing flange. If you want to know the year and month of
production, look at the same place on the passenger's side.

 

305 heads have been put on 350's/5.7's many a time. Are the heads 416's?

 

I'm not finding FPR in the regular go to sources for suffix codes. I have to go with S10-37 in that you need to start with the casting number of the block from the back left corner.

 

Yes

 

I did find this and it doesn't make me to Happy

http://casting.brianesser.com/engine-codes-2/small-block-chevrolet-engine-suffix-codes/

 

I'm really don't understand it this engine have a throttle body injection on it and it says the suffix code is a 1978 no TBI in 78

 

Paging @squirrel please pick up the white courtesy phone.

 

This?
1872 V 1962 327 MT FULL SIZE

 

Where are you finding any FPR suffix code? unless my eyes are seeing it wrong.
I even found one source I have never seen before http://mkmann.com/pdf/SBBlockID.pdf

That shows the codes by year and it isn't there.

Now what is the casting number off the back of the block?

 

I have that page open and it flat ass is not there. http://casting.brianesser.com/engine-codes-2/small-block-chevrolet-engine-suffix-codes/

The only thing I have found starting with FP is a 230 six cylinder in a Taxi cab.

 

What I can find is that the engine was assembled in flint Michigan on July 2. What year I don't know but that would come with the date code on the block plus the casting number will give the bore size and an approximate year. I've pretty well blown the last hour on this, have been on more sites that have suffix codes than you can count and none as I said before show an FPR code at all for any engine.
https://www.speedwaymotors.com/the-toolbox/small-block-chevy-engine-codes/28660
http://mkmann.com/pdf/SBBlockID.pdf
http://casting.brianesser.com/engine-codes-2/small-block-chevrolet-engine-suffix-codes/
This is the normal small block Chevy go to suffix code source
https://nastyz28.com/decode.php

 

The assembly code is FPR...I couldn't find it anywhere either. The stuff stamped underneath might be a partial vin. Can't tell. Its a later 70s engine at the earliest because of the short pad for the assembly info. I think they switched to the short pad about 1977 give or take a year or two..

 

Thank you so much for your hard work trying to find this I have a feeling that somebody put a lot of stuff from different engines on this block I also think it's a waste of money for me to build this I understand the 305 heads from small combustion chamber but they do not flow worth a shit

 

...One of the better things from Flint...days gone by.

 

And also these are center bolt heads throttle body injection with 5.7 on the back of the engine

 

Those are not 416 305 heads.

 

1986-91 14101081 305 1.84 1.5001 - junk cylinder head for high performance

 

Your the one who agreed that they were 416's earlier is my only point.

 

Sorry about the misunderstanding

 

FPR --truck 1987 350 160 hp manual

 

partial VIN says CH...... which means Chevy truck from 1987, so yeah, it looks like the post above this is the answer you're looking for

 

egads is correct
federal emissions 1 ton according to the book

 

That explains the non roller set up thank you everybody for the help