brake question

[HiddenDragonv6]

i was looking on 3rd gen resource and saw some cross drilled brakes for the front and rear used. i was wondering if i could swap the disc brakes on the front and drums in back for the cross drilled ones and how expensive would this be?

[3.4 slow to go]

how can you be sure they're not warped? and if so, how can they be machined?

it's easiest to get the rear from a donor car, & snag the master cylinder & proportioning valve from it too. also inspect the parking brake setup. I believe it's different than the drum set up.