Back in 98' I did a Proflo unit on a 355 and once all the bugs were fixed it is "set it and forget it". Drove it coast to coast and back in 9 days. Went from Loveland pass 6000 ft at 36 deg F to Death Valley at 109 deg in a matter of hours without a hiccup. Throttle response is unmatched.
I have the pro-flo (edelbrock) on my 350 engine. Umm, seems ok, engine runs strong. Prolly 420hp if I built it right. Can control all the variables from the front seat. Im a fan of EFI. Wasnt cheap. JR