what about this set up?

[82 GT]

I found a mustang for sale with a '92 H.O with a T-5. Motor with an E cam,long tube headers,edelbrock intake,650 double pumper,MSD ignition,electric water pump and 3inch exhaust sytstem, 8.8 31 spline axles with 4.10 gears.
It has subframes, 6pt.cage, control arms.
The guy says it good for high 12's-low 13's
Is that possible with the stock heads?
The car is a 1980 mustang and wants to trade even up for my stock '88GT



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'82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust.
1988 GT...T-5,bone stock