my friend blew a head gasket also, on his 347, it made it run a bit hot, but he fixed it, and he is not the best of mechanic, just prepare for the job, and get a torque wrench, we didnt know his gasket was blown, he went from 12.2@ 113, to 13.0 106....so we checked the oil for milky stuff, sure enough......
I have to add coolant to my rad also, every now and then, not to often, i think im gonna have to pull the heads one day myself, while yours are off, if they are high mileage get new springs, and guides.....good luck, let us know how it goes.
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer 
Race weight: 3,120
E.t-13.57 with 26x10.50's e.t. streets. 1.88 60'
mph- 99.92 mph
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