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A Q-Jet is great. Once warmed up (50-miles).
The 1987 TBI is better till that point. As a stand-alone it has aftermarket support going back twenty years in retrofit. HOWELL.
Q-Jet advantage past that is at WOT.
Dad had an ‘87 2500 V8-454. 3.54 years after TH400. Dead reliable thru 190k miles once a better radiator fitted. I added a Cloyes True Roller and Edelbrock water pump. Ran M1 5W-50. Brought consumption down. Today I’d run Rotella -T6. BALDWIN oil filter.
I was liking DENSO Iridium plugs before getting out of gasoline in 2007.
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