Was from US Carberetion, don't remember exact kit but they are pretty good with facts and info iirc. Very easy to install and runs flawless. Get on their mailing list they occasionally have killer sales.
Back in the day before Fedex ground, Fedex shipped EVERYTHING, every, single package went to the hub in Tennessee. You ship something to your next door neighbor and it was flown out of state before coming right back. It had to do with their optimization system and it worked very well. This was in the 90s.
When the airplane fuel costs started to be an issue, it changed and they figured out a way to do local turn-arounds.