bro, those 920's look tore up from the floor up.
if you wanna keep it on a beer budget, snap on those 675's and ship it.
there's no telling what could be wrong with those 920's-- janky guides, wasted seats, bad deck, cracked, and on and on. i wouldn't run those without a hot tank, mag check and the okay from a machine shop.
and i certainly wouldn't take apart a perfectly good set of heads to play humpty-dumpty with a roached out set of cores.