In order for a car to be fast it has to be running right first. In terms of ignitability, oil is up there with diesel fuel and that will ABSOLUELY KILL your track times.
www.fordmuscle.com, has an article about their Holley systemax heads that started leaking alot of oil (i know it's not what your car is doing, but it's for comparison purposes), anyways, the car is a low 13 second car and it ran a low 15 or something because it was sucking so much oil. I can garauntee that if you fix your driveability problems first that you'll be satisfied with the power of the vehicle. Good luck!
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Mustang Parts Specialties ripped me off, don't buy from them.
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT