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I'm conducting the final prep of my donor car parts in advance of ordering my Mark IV kit this coming fall. My engine is a stock 1988 5.0 Speed Density unit that I've topped with a Cobra intake. My question is should I purchase a 65 or 70mm throttle body? Thanks...
 

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I have a 70mm Edelbrock TB on mine which is the same setup. You can fairly easily convert that engine to MAF with a new computer and MAF sensor.
 

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I had an '86 Mustang which was still the speed density set up and ran a 65 mm throttle body - along with GT 40 p heads, Cobra intake, forged Wisecos and a Comp cam and it ran great.
 
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