Man, this is a good question. When I was in High school I knew guys that would swap 360 heads on a 318 and swear it was a good setup. years later, as a professional line tech at a dealership, I had an old head mechanic tell me that "compression ratios and chamber size effects all that" when he saw I was going to throw some 360 heads on a 318 build. I did take his advice and stay with the 318 heads on my 318, buy have always wondered how that engine would have ran with the 360 heads on it. as far as the 340? I think I would want the 2.02's myself. I think it will be ok, because basically the later 340's had 360 heads on them . I do think they had lower compression with those 360 heads also.
