I'm using stock unit, new throttle shaft bushings, Dremeled lip down, thinned throttle shaft, stainless 1/4" injector spacer, 18 lb spring, new injectors, vortec fuel pump, adjustable fpr & fuel pressure gauge.What Throttle Body are you going to use? The stock 42mm won't give you enough flow when getting up over ~4800RPM, the 7.4L TB won't idle very well plus, it's too big (50mm) for your 3704 manifold. You can get a bored 46mm (650 CFM) with all the "Ultimate Mods" from SPR and bore the manifold out to 48mm for better flow.
https://www.ebay.com/itm/46mm-PORTE...837306?hash=item3d963196ba:g:mpwAAOSw2xRYWVJj
You'll want an AFPR and probably an 18 LB or higher spring. You can get the spring ordered with the TB. I don't know if he offers an AFPR but you can get it here. HTH
http://www.rvmorsemachine.com/product.htm
I should have enough cfm, and be able to adjust fuel pressure as needed.
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