Chevy flywheel questions

Im putting a 4.3L V6 from a 1989 full size chevy truck in my 1950 Chevy 3100, along with a T5 from an 85 (I believe) Camaro. The 4.3L came with a 168 tooth flywheel, and the T5 came with a 153 tooth flywheel, clutch, and pressure plate. The 4.3L stuff uses the 'new style' crank, and the T5 stuff uses the 'old style'. Is there any reason why I cant use the T5 flywheel on the 4.3L? If not, what clutch and pressure plate would I need to use on the 4.3's 168 tooth flywheel?

 

The '85 flywheel won't work on an '87-up, the '87-up has a different bolt pattern and it is externally balanced but the clutch will fit the newer flywheel. The '89 would have had an NV3500 on it with an integral bellhousing and I have no idea if the '85 bellhousing will clear the 168 tooth flywheel.

I'm putting a newer style SBC in a '66 1/2 ton but I'm using the NV3500 5 speed.

 

Hmm...so it looks like if I wanted to stick with the 153 tooth stuff, I would just need a 153 tooth flywheel for a new style crank? I would rather go that route and stick with the lighter flywheel.

 

http://www.summitracing.com/parts/RAM-1512-12/

Autozone Pioneer FW-156

This is about as cheap as you get for a new one, but note that it is the same one as the 5.0 & 5.7 V8. Find a '88-'92 Camaro with a T5 and you are all set.

 

2 piece rear main seal motors use different flywheels than the newer 1 piece rear main seal motors.

The transmission doesn't care about the flywheel. You should be able to use the 4.3 stuff, just make sure the disc is the right size and spline count.
Unless the 4.3 was an automatic and had a FLEXPLATE on it instead of a flywheel...