thats taking to big a risk IMO. Headers are, for lack of a better word, BITCH to do. why temp it. For headers, Stage 8 locking header-bolts, and good QUALITY gaskets are the only way to go..unless u enjoy taking headers off for a leaky gasket, or re-torquing bolts up.
i do relize some ppl have good luck and get by with stock stuff, but i would rather do some 99% fullproof the first time.