Just anouther thing to consider, the 67-69 Blocks do have one more differance, the firebird blocks have a differnt set of motor mount bosses than the A & B bodied cars, so if you really need to get a 68 or 69 block look for a FB block. The others blocks can be easily made to fit with a set of adaptor plates but that adds aprox $70.00 to the swap with no performance gain. The 70 to 75 blocks have all 5 bosses present & taped, and the 76 to 79 blocks only have the firebird mounts drilled. Just some info to help avoid suprizes.
