hello I have a 70 skylark custom with a 350-4 hi compression and i want to put a 455 in it. I have a 76 model motor that ran when i pulled it out of the car. I want to change the heads on it maybe put some 430 heads or 70 model 455 heads on it. I read that the water ports on these blocks are different and a special head gasket is required to run earlier model heads. Can i run any model heads on this block i want? Any help is appreciated.

Try this: http://www.buicks.net/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=16;t=000040 . Bob, that search function is very fast now! Thanks