With a street motor I wouldn't go much over 10:1 compression. Much over that and you will need to mix booster with pump gas, 'cause 93 octane won't cut it. 375 h.p. should be no problem with the right combination and 10:1 comp.
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1985 Mustang GT
'85 GT "Red302" 12.96@107.1 N/A ... Sprayin' for the 11's
2003 Torch Red Mach1 
'68 Fastback ...331 Stroker "Restomod"
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