Okay Gentlemen, now we can have a discussion...............
Today I went out and thanks to VinceS427bb I knew where to look for all the numbers and was also given a good site to decode them. Here is what I have:
Block Casting Number: 3970010
Stamp on Pad Numbers: V0107CNR 10C142624
Head Casting Number: 3927186
So just for follow-up, it turns out to be a four bolt main 300 horse 350 built in Flint on January 7, 1970. So just that info alone was worth the trouble to get all these numbers. Also apparently it was a 1970 Chevrolet built in Southgate, California. For what that is worth.
On the heads now they turn out to be small double hump 1970 heads with 64cc chambers and I know for a fact that I got lucky with the 2.02 valve sets.
Thanks to you gentlemen I now know EXACTLY what I have and some linage on it. But this all brings me back to my original question. I want to buy a new set of heads, the Summits look good to me and now I know that my heads have an 8cc smaller chamber. What kind of difference will that make and would you recommend putting a larger combustion chamber on the engine. The purpose of this swap is to be able to put on a fresh set of heads quickly without waiting for a machine shop. In this thread are all the specs on my truck as far as transmission, cam, gears and carburation. So it seems the only thing I would be doing is lowing the compression a little. What do you think of this situation? Yes or no on the head swap?
Thanks again for helping me finally figure out what this engine truly is.