Good job on the sig.
On the 1980 EVTM, there is one, and I have a copy, but I don't have it on the site. For the most part it is the same as 1981, but there are some differences. I'd try using the 1981 version and if you come up with differences or questions, ask and I'll see what I can find.
It is a major effort to put an EVTM on the site, and I'm not ready to do that right at the moment given what I'm doing on other things. But should be able to help if you have questions that the 1981 version doesn't answer.
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI