1973 360
Actually not to bad considering all of the imposed emissions on it and reduced compression ratio.
A lot of people trans it but it’s nothing that an ether a piston replacement can’t fix (super hard back in the day) or a head milling can’t fix. Even though that would require a big cut on the head.
I used to get trashed for using the 360. I just told everyone that I fixed the issue. KB-107’s.