Replacing FAST EFI on HP 383, with what?

For the street
You need a single 4bbl intake and a 700 to 750cfm carb.
you don't need anything fancy when it comes to the 727; just a basic HD unit and I like a TF-II kit.
You didn't say which purple( there's like 4 of 'em), But none of 'em are real friendly towards 3.55s unless you have a TC matched to the cam and lots of compression.
Those heads wouldda really liked a fast-rate of lift Voodoo cam, but then it wouldda wanted headers.