Which Trick Flow Heads with 318 (future 408)(part 1 of my plan)

Excuse my ignorance, but is this common practice for $2000 new quality heads? Is the consumer expected to take them apart inspect and do finishing work?
No. You gotta remember there are all levels of experience here. Some want to take em out of the box and bag and bolt em on and roll. Others will fully disassemble them, using specialized tools and procedures to verify. Me, Id visually inspect them, maybe check a random valve or two with my small hole gauge set and a micrometer Do a quick valve lap or two to check seats, basic stuff. Then I'd run em. If money is no object, tools and experience are aplenty, of course you'd go all out on the rectal exam. Or if there were machine shops at every corner that'll do all this for next to nothing then by all means that's what you'd do. Don't forget, you could also buy them from some of the guys that are known here with excellent reputations that likely offer these heads at reasonable cost where much of these checks are done.