I had a friend that had an old sbc engine in his barn that belonged to his Dad. His Dad told him it was a 300 HP 327. He brought it to me since he had no use for it, I put it on a stand and didn't get to much time to check it out but I did get the numbers off the heads and block. It had a spin on oil filter and a bolt in the crank snout so I was figuring 68, 69. Well the double hump heads were done in April 15, 1966, they are the 462's, the block 3970020 is a 69-73 307. That was a bummer. It's got a factory cast iron 4bbl intake with a Carter 4 BBL. Looks like an old 6 in Cal Custom used to be chrome air cleaner. I wish the short block had matched the heads.