milling B/RB heads

I am tossing this around, but have no idea on what you can and can't do with mopar stuff....or what is good and bad....
to go with the .509 cam in my *as far as i know* stock 400 bottom end, i thought about getting new stage V heads and milling .060...good, bad????

what I know now:
72 400 block and rotating assembly (was told it's out of a roadrunner)
windage tray
.509 cam
mallory ignition/dizzy
torker 383 intake
452 heads
absolutely zero idea if the heads and/or block have been milled

my thought:
get the stage V (better head), take old head off and measure for block milling, mill new heads accordingly

I think this will save the most down-time

I had thought about the indy 440SR heads, since they have 75cc chambers and would give me about 9-9.5:1, but being aluminum that would be like the iron heads now, assuming they are not milled............................
anyway...............