I don't see the head studs to be a weak link, since the SRT6 uses similar design head if not the same heads. the SRT6 puts out 410 hp modified, so the heads studs can easily handle the pressure.

The weak area might really be the crank NA, but who knows?

Big bore kit would be a safer upgrade, if only you can find a shop skilled enough to make a quality piston with plenty of valve relief, preferably forged alloy slug with new sleeves.

LA sleeve carries a full sleeve kit for LS1's for only $750, not bad price for speed parts, granted you do have to hone them to fit your piston.