Is it possible to powder coat the frame of a j Truck or should i just paint it?---i will por15 it.

pulled cab off of frame today...thank god i did... i removed frame bolts and when i lifted it the rust holding the bushings together was enough to destroy what was left of the mounts...they i can replace no problem but the bolts on the front of the cab both broke....do i have to remove that section that is reinforcing the firewall or can i remove all of the guts of the cab to get to it and replace it?

I will be using a 4" spring lift should i use this opportunity modify my shock or spring mounts at all?...the front shock mounts are broke and the rear is only tolerable...i will be reworking some of my spring mounts aswell.