I think that having the wrong cc chamber and resulting higher compression is over fueling. So it goes exactly along with your own theory of over fueling. Is it possible to have too much fuel delivered by the injectors for the chamber size?
I thought cams, injectors and heads had to be matched up with the same purpose in mind. Cams have rpm ranges they work best at. If you have a high rpm cam (high top speed) they you want a certain flow carb. If you have a low rpm cam (fast starts) then you want a lower flow carb. Two much fuel is counterproductive.
Chamber size probably needs to be matched properly too. As do injectors. There are different injectors. Ones that squirt, ones that spray, ones that mist. Just like carbs have 2 barrel, four barrel and different size tubes and bowls.
Don't match things up right and more fuel results in less horsepower or less performance, detonation problems and possible flames out the back.
Out of curiosity why are those parts useless? Do you want to get all of them at once. I would have figured piecing them together would be the only hope.
I am serious when I say this. I called 5 Ford dealerships yesterday and asked them if they had any left over NOS 87/88 Tbird trim pieces for you and none of them did and only one laughed. I called the one where my wife and I bought the one for my in laws 40th wedding anniversary present in 1987 that my mother-in-law still has. I told the parts guy that it came from there new and my 89 years old mother-in-law is expecting them to still have what ever part it needs. He laughed.
Thanks for the trim info. I got the one off I needed to get off to tap out a dent under it and fix the crack in it.
I saw a couple pieces on eBay the other day. They were new old stock. They are still there. I was looking but am just going to fix the one piece on mine.