Sorry to hear about your head gasket, but it would be best to rebuild now..don't let it get worse, the more power and stress you put on it the worse it will get, I know thats not the answer your looking for. See if you can find a low mile stock block to swap in until you can afford the rebuild or I hate to say it's time for a new short block $1500.00.
You may get away with swapping out the head gaskets, see if you can determine what caused it to blow. I had 180,000 on mine, and my buddy Dan had 240,000 on his stock assembly
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98