Hello, I want to put a 454 on my nova(Street&Strip car!) the car was originally a 350 powered car! What I want to know is what kind of 454 should i go with, for example what year block should i be looking for? Are early 70's 454 engines a good choice! Is it important if I find a 454 with oval or rect port heads, or a block that has 2 or 4 bolt mains? please help me know what kind 454 engine is the most desireable! Thank you for any replies!!-Danny