MAF & TB install
 

Will installing a 73mm MAF & a 70mm TB give me about 15 fwhp?
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'91 5.0 HO T-5, ported/polished/milled .030 E7's,1.94/1.60 stainless valves, triple valve springs, 1.6 rr, March performance pulley set, March A/C eliminator kit, K&N, glasspacks w/dumps (stock air&fuel delivery with 40lbs. fuel pressure)

I would go 76mm C&L and a 65mm TB, it is very possible to gain 10FLYHP with those changes.

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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!

Ditto on the 65mm tb. 70mm will hurt you instead of help unless your running a blower or other power adder.

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91 LX 5.0
Z t-5, 3:73 gear, Vortech 73mm Mass Air, Accufab 65mm TB, BBK underdrives, Crane HI-6S Ignition, BBK unequal length headers, Bassani x pipe, 2.5" Dynomax Super Turbo cat back, Kenny Brown Super Subs, Factory Five Control Arms, Mac cold air kit, Nitto D/R's and more to come!