ecm swap

what would it take to put a 7747 into a 8063 wiring harness.This is in a cut down harness,my son put a mild built 350 in a Bronco 11 a few years ago and had a chip burned for it.This was before I got into tunning and knew nothing about it,now looking at his bin something is very odd and there appears to be little support for the 8063.I ask about the 7747 because that is what I am most familiar with.Any other suggestion would be appreaciated.