I found this post from days far gone but here I am years latter doing just this.  Got the motor fired for the first time today.  58 Cab and frame with 57 clips front and rear, 95 Mustang 302 HO roller cam 5 speed and too many mods to list.  The 302 fired right up with the Sniper EFI no to clean up wiring and finish putting the body together. Going to be sometime before this hits the road but my 57 Customs 300 is out for paint and body work.