Avoid the "new bolts?" question entirely by throwing some studs in there. 
very good idea 
Changing the oil and filter, Changing the fuel filter and using ARP studs is probably 3 of the best things you can do for these engines to make them less troublesome and I've had trouble from all 3 till I found out better. Those stretch bolts are just way too much trouble torquing and wondering if the block or head is cracking from the noises and jerks they make in the process. I would do a retorque though even with the studs and don't be afraid to pull them to 95 or 100 if need be {with their included moly lube.}
studs weren't in the budget...
I went with a new gasket and bolts, but it back together and its all good now..
this is a freshly acquired truck...so, once the head was done we went to take the truck for a test drive and the engine ran well...
But...
Then the trans was making "grindy" noises and wouldn't shift into fifth... we got back from the test drive and poped open the trans to find a hand full of metal shavings mixed with the gear-oil...
excellent!!!