I've been trying to figure out the best way to build the 360 for my Challenger. I'm considering magnum heads but have a couple of questions.

First - are the holes for mounting the PS pump, A/C, and Alternator bracketry the same as the LA heads?

Second - any thoughts on what effect they'll have on compression ratio on my '75 360 if I stick with the stock pistons?

Thanks, Guys! If anyone can help, I know you all can.