another vendor who seems to know what he's doing with the GM TBI/TPI system:

http://customefis.com/

he's modded GM computers to be able to use a flash chip, that allows for tuning on the fly, and doesn't require a chip burner.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)