The SBC in in my '32 has engine ID code 3970010 on the left rear of the block. Apparently this ID's it as a 350ci. The suffix code on the right front of the block is "TDS". According to two internet sources this ID's it as from a 1980 3/4 ton pick up, 170hp manual trans.

I'd like to put a set of aluminum heads on it. Without tearing it apart first, can anyone tell me what the chamber volume may be on the stock heads, and/or wether the piston tops might be flat or dished?

Thanks