How much horsepower?
 

I am bulding a 347 stroker with the following.Forged crank&rods,forged pistons,stud girdle,Lunati 51025 cam,Holley systemax II heads & intake(both fully ported &flowed).30lb.injectors,75mm tb,75mm mas,
1 5/8 longtubes.underdrive pulleys,Msd 6al.It's going into an 88 GT with a 5speed &4.10's.Any guess as to what she'llrun? Thanx

I'll have about 10.5 to 11 compression ratio

What kind of pistons are you using? That looks like it will be a hell of a setup..Mine is pretty close to it but havent taken it to the track yet and wont til i get some traction. I would say 11's or low 12's..If you can keep it to the ground.

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347 Stroker Motor: Balanced, 30lb Bosch Injectors, Cobra Computer, Cobra Transmission, GT40 Ported and Polished Upper and Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, March Underdrive Pulleys, Electric Fan, Accel Performance Coil, Accel 300+ Racing Wires, NGK Plugs, Ram Air, K&N Filter, 77mm Mass Air Unit, FlowMaster Exhaust w/offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, High Tolerant Painted Calipers and Drums.

I am using probe industries forged pistons.
11's is what i'm shooting for and somewhere in the neighborhood of 450 - 500 horsepower at the flywheel.