Quin, it's funny that you said that because I was thinking the same thing as a wrote it. http://www.mustangworks.com/msgboard/smile.gif I got that number somewhere on the web. It's probably a conversion from grams to lbs. I said "about" since all fuels have different weights.

I think if the ignition were set up improperly, the car would run poorly throughout the power band. When I first set mine up I forgot to hook up the retard line and it completely bogged at WOT. It's worth looking at, though.

My own suspicion is that it is a mismatch of components. B303 cam with 1.7rr rockers stock heads and intake with 70mm TB and 76mm MAF.

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351W 89 Mustang GT Convertible

My poping sound was there before i installed my ignition system

Can anyone tell which MAF to get 73mm or 76mm, whats the difference beside the size. why would i buy a 73mm when i could get a 76mm?
Advise?

I think what you have is correct for your throttle body. You need to get new heads and an intake to support the air flow as well as modify exhaust.

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351W 89 Mustang GT Convertible

OK here are all my mods,
1 5/8 headers, off-road h-pipe, dynamax muffs, no-smog pump, no-A/C, pullies, b303, 1.7's, 70mmTB, ported upper and lower intake, shave heads(.020) and block(.020)