Hey guys, I’m working on a 1951 shoebox ford coupe that the previous owner put a 283 in. I’m a ford guy so I have practically no knowledge about Chevy engines at all so I’m sorta stumbling along here trying to figure it out. The car has been in his garage for over 50 years. It had a blown 6 so he put the 283 in it. The motor is a 1967. He said it came out of a 67 full size Chevy that was wreck with 6000 miles on it. The only changes he did to the motor was swap out heads he had redone so it would have the alternator mounting hole on it. It still had the original 2 bbl intake on it, when I got it, but he gave me a cast iron 4bbl intake for it as well. I decided to run the 4 bbl cast iron intake and a 600 Edelbrock. When I took off the intake and the valve cover everything looks brand new. I was then given another set of heads from my buddies dad that he said were power pack heads. They are in real good condition just been sitting for years under his bench. This is were I am getting confused . The heads on it have a casting number of 3970126 ,the intake has 3799349 on it date code was D-18-3 . what I saw online is it’s a 63 passenger /corvette 4bbl for 300 Hp 327. The number for the heads came up as a 327 or 350. But the years ranged from being 67-71 or 67- 79 either a 327 or a 350 depending on what website I looked at. Also the valve sizes are all listed different depending on what site as well. Last one said it was a 327- with 1.94 and 1.5. I’m don’t plan on taking the heads off the block right now since they look practically new. But I’m curious if I’d get better performance running those heads or the power pack heads(don’t have the numbers on me right now) and the cast iron intake I have. A buddy offered to give me an aluminum intake but it didn’t have the oil fill on it and it looked the same as what the cast was so I passed. Just trying to get an idea about what I have here and what I could do with out rebuilding the whole thing. Any advice or pointing of where to look would be appreciated . Sent from my iPhone using H.A.M.B.