396, the trimming does look good.seems lke it might weaken it a bit. Wow, Dusty that is a fancy bit of enginering.nice to see those pic's on your page .Your front A arms are different than mine,easier to mount the roll bar to the plate. I wonder if your A arms are narrower than mine ?springs are not the same either.they look like they are not tapered. did you modify the mustang II upper perch to accomidate the smaller top diameter springs? thanks for measuring,Ebiggs. and all.