Stock Magnum EFI with a cam upgrade.

It’ll work fine and compensate slightly while it’s stock. But get it tuned. There are plenty of tuners that can tune it. Look up FRP tuning. Flyin Ryan, he’s in Florida and does mail order tunes and can set up the stock jtec for you. The xr264r is not wild by any stretch and comp lists it as efi compatible.

Flyin' Ryan Performance