has anybody done a tbi 5.7 swap into a 67-72?

[extd56]

Lots of people have used the original wiring and adapted it to work, just matters on your skill level. You are also talking about wiring that is 21 years old that has probably been cut into over the years and could be brittle from the engine heat. I used the Howell kit on one of my trucks and makes it easy to call them up when I have a problem using there harness to try and fix it. If you use hte original harness you are on your own.