Outside of the fact that finding performance parts for the early 425 super rocker 45 degree bank angle..is there performance differences in the 45 bank angle versus the 39 degree angle? I assume pistons and rods etc are the same? Is the rocker assembly the same? Do the A heads flow as well as the B heads etc? Can you still get pistons for a 425?

 

Pistons are available from DSS and Mahle, with the latter being the more modern one.
And I offer cams for both bank angles, no problem.