Running E85 it won't matter what compression you are, you're totally safe. Probably will dump 2 degree every 3psi to keep the head gasket alive depending on what's in there.
650whp through an auto on a Mustang Dyno losing 20% is 812hp at the crank, not safe IMO for a 2 bolt. Hell I have a 4 bolt and I would just get a IA2 for that range of safe power.
I'd look into the Torqstorm SC, get into a max 520whp (650hp) area and call it a day on a 2 bolt. 4 bolt is where I'd feel ok making 700+ at the crank on a street car that I wanted to live a long life.
Sounds fun, enjoy
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct at 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10" 0 Stat, Ricks SS Gas Tank, Magna 4303, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" Headers & Borla Pro XS 3" Muffs, Alum Rad & Dual Fans, 12:1 Box, UMI Control Arms & Viking Berz Fr + Rear CO Shocks, Hella UP28 Vac Pump
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