I appreciate the info and pictures. After thinking about this, I'm not going to change it over. I bought this car as a $2500 rust bucket and have done everything to it except final paint. It's been a insane amount of labor, and I can't hack up the tail panel. I'm not convinced how much more power the 71 engine makes over the 70. The 71 pistons have valve notches and the cam is slightly better. For this project I'm not trying to qualify at the top or anywhere near it anyway.