Replacing FAST EFI on HP 383, with what?

Find a Big block High Performance TQ and be done. Ran one on a 383, 727, 68 Formula S daily driver for years. Factory everything but a 72 400 intake and TQ. Decent mpg and enough get up and gone to satisfy. You can always try what you have also. As for the 727, replace the fluid, filter, and adjust the bands. Try that first.