Normally seats are not replaced unless they are sunk down too far or the head needs welding in the combustion chamber.

Again my personal preferance is to find a set of used heads at a yard and get them rebuilt. That insures (hopefully)you started with a high quality set of cores.

Regardless, that is a decent price and the outfit looks OK. It never hurts to ask a few questions of their sales staff about how far they will go when machining the deck and if it's out of spec do they still rebuild the head? Some companies will mill the heads out of spec but include a block shim ( thats not my prefered fix, it works but.....)?

Heads Only

IMHO it pays to do a talk to the manufacture ask a few questions. Worse case you pay a few dollars per head more. Best case is these are good and you dont need to worry.

Good Luck,

Kevin