I just bought a 1967 Bel air (Impala) with what I was told was a 454 for $1000.00. I ran the numbers and it's seem to be a 396 (cast number 3935440)with the 336781 heads on it which I thought those heads were for a 454. Wouldn't that lower the horsepower?? Now next to the cast number on the block is a "T" but it also has "PASS" so I don't know if this came out of a truck or a passenger car. it also has CON 2 on the block next to the numbers on the block. The guy that I bought it from said he got it from a women and it used to be her boyfriends. So who knows whats been done. It has an edelbrock hige rise on it and headers.. here's a couple links to pics of the block. I will add more if you need.

http://i40.photobucket.com/albums/e2...0/DSCN2402.jpg

http://i40.photobucket.com/albums/e2...0/DSCN2401.jpg

http://i40.photobucket.com/albums/e2...0/100_2005.jpg

Any help would be great Thanks