Heads will be the most important factor in this combo. Trick Flow heads are AWESOME and they are cheap $995 from Mustangs unlimited VS about $1,200 + for AFR Heads. With the right cam TW heads will out preform AFR heads. I have 2 friends, one w/ a 91 LX the other w/ a 91 GT. The 91 LX has all the basic bolt ons and full exhaust, TW heads, Ported Cobra Intake, and an alphabet cam a B cam I think he dynoed at 299 and to 291 ( diffrent dynos) The 91 GT has full exhuast and basic bolt ons only diffrence being he has cats and a diffrent cam. For heads he as AFR's GT40 Intake and I belive a crane cam, he dynoed at 270 on the dyno that the LX dynoed 291. so point being if you put together the right combo you can come close to 300 on the dyno.