i havent had the best of luck, i got a 350, i got it from my grandfather for christmas that he bought off of a buddy of his, (It was only 6 months old when i got it, it was supposed to have a mild cam, it was bored 60 over, holley carb, headers, edelbrock performer intake it was a nice engine) that he just got it out of a truck he bought...well to make a long story short i took the valve covers off to paint them because they were all scratched up and...sand...so i sent it to my mechanic and he said that it went completely through the motor...so i decided to get another 350. This is also supposed to be a nice engine, edelbrock intake, headers, supposed to have a nice cam, and its been rebuilt and never installed into anything. So after i put a little beauty paint on it, its now ready to install. wish me the best of luck.