High Compression 390

do not change rockers- you have to change pushrods too and go through the rocker arm geometry procedure all over again- best to do that on the engine stand
you have a wide ratio 4 speed so do not want a torque drop when you shift
Pick your RPM range- where do you want your torque drive-ability or high rev hot rod- be honest- I won't tell
that will determine your cam duration
then pick the compression to go with the cam duration doing compression first is backward
low compression and big cam is a stocker race build- a dog around town
high compression and a short cam will detonate into oblivion even at your altitude
you need to work together
.050 can be way off as far as picking seat timing
Mike Jones is best for the lower compression short cam combination with a HT or any compression with a HR
Comp, Erson, Isky, have nothing in the range you are looking for in MOPAR
Try working with Lunati- perhaps or Crower lurker will chime in but would have to be custom- nothing in the catalog- same with ENGLE but most of their catalog mopar cams have been custom anyway, also Howard