[hinoonaz]

Revisiting going EFI from a Holley 650. It appears that there are two choices from Holley for a 347 with a lopey cam that likes 2000rpm and up for throttle response. Is vaccum a major factor in determining which EFI manufacturer to use or stay with what i have. Too much info and not enough knowledge to sift thru what works without days on dyno. Just trying to make up my mind. Our travels are between sea level to 7,000'. Thanks for advice, Gary