i asked a similar question here a while back and the general consensus was that it really doesn't have a noticeable effect,but that was about a "larger than the bore" gasket.one smaller than the bore is definately asking for trouble.
worthy of further research,but a tough one to prove.
head studs are always better than head bolts,but you can't pull the heads,with the engine in the car.
if you can find a 4.060 gasket that would be about right.
86 camaro,383,topline vortecs,scat crank,wiseco forged 9.5:1,6"scat rods,comp xs282s,performer rpm,750 proform vac sec,msd in cap, hooker coated 1 5/8"headers,3"flowmaster,700r4,2800 stall,3.42 10 bolt posi,hotchkiss lca's,aje tube k member & a-arms