Technical SBC casting number assistance please

Could anybody kindly shed any light on these codes? I found this tucked away in old shop today. The block casting number is 3914678 which indicates a 1968 either 302, 327, or 350.
I believe the partial VIN reads 781150482, which I can't seem to decode as there are no letters in it, according to the NastyZ28 site
As well as the casting code V06I05R, which I believe indicates a Flint motor built June 10th, however the suffix code 5R does not seem to want to be found. Even if the suffix code is O5R that seems odd as well.
If anybody with greater knowledge than I could take a moment to shed any light on this I would appreciate it.
Regards, John.

 

this should help:
http://www.jalopyjournal.com/forum/threads/tech-chevy-engine-numbers.184304/

 

not much info available on stuff that was used in Canada, that I know of.

 

Thanks guys.