69coronetkyle

so i just bought a hemi orange 69 cornet with a 318. I also bought a 73 440 out of a motor home. im not sure what to do first as far as performance upgrades to the motor. I have a 8 3/4 3:55 suregrip diff and a torker II intake and an aluminum radiator on the way what else do i need. which cam? what should I do to the heads, port them? mill them? if I mill how much and will I hav to change out pushrods and lol how much is safe to mill, also will I have to mill the intake side of the heads as well? also how to Id which heads I hav thanks