*sees single pattern 480 284 cam*
mmmrrrppphh.
i mean, sure? i personally would go with something a little smaller and more modern. but it all really depends on how you want to use the car and what your expectations are for the motor: power wise, driveability, etc.
if you have the compression, stall and gears then all the better.
it's a slippery slope on the heads. if they're super waxed, i'd probably try and find something i liked a little better that was cheap, and do those up or pop for just some basic remans and call it done. but the 974 heads are one of the "better" smogger heads, and they should have hardened seats.
but, it depends. if any work has been done on them: guides, cut for springs, oversized valves, porting, then it may be worth sticking with them.