I was teaching auto mechanics in a Tennessee state trade school, and attending instructors' seminars every summer at the GM training center in Memphis when TBI was introduced in the early 1980s. Even then, the GM field engineers said TBI was a temporary fix to comply with EPA regulations, while they developed a more sophisticated sequential port injection system. The first GM SEFI port injection system was introduced on the Buick 3.0L V6,I believe in 1983 or 84. I guess they were lying to us?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!