Stuck caliper bleeder screw

[Cyc10@aol.com]

I just purchased a 70 B and am in the process of getting it back on the road. 
 The front bleeder screws on the calipers are both frozen solid. I have tried 
hitting them on the top with a hammer, applied heat with propane  and used PB 
Blaster.  I would like to remove them without damaging the calipers.  Any one 
have  any tips?

Thank You
Al
60 mga Coupe, 62 MkII Rd, 70 MGB Rd/OD

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