As far as the Paxton S/C, they are /were not very efficient. And there is quite a bit of noise. It is an interesting config, more period-correct looking, when you add the Paxton. Funny thing is, I just sold a complete rebuilt early Paxton 2 months ago. And it will be very tight under the hood (ask me how I know with my CRI) to get that airbox on a carb.
You would actually be way ahead, IMO, with a later front mounted S/C from a Fox Body Mustang or go with a new/rebuilt 5.0 roller short block with really good aftermarket alum heads and a throttle body EFI system like the Holley.
I have a low milage 5.0 that I added TFS Twisted Heads, extrude honed early EFI lower, port matched to the heads (which have a stage 2 porting job), Much larger fuel rails & injectors, bread box upper, 75mm TB & 80 mm MAF, and the CR headers (modifying the CR mufflers to more free flowing mufflers)
I can now return to a more stock style hood scoop. I am expecting somewhere around 325HP since it is the stock cam.
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