Just as slow as before my mods..

Yeah, it drives fine, although the gas tank leaks too after mechanic installed it twice. So, sadly, I don't even drive it because of that. Just trying to sell it at this point. I really loved this car when I first saw it. The paint is beautiful and the body has no rust anywhere, was also rotisseried paint job. I think it might be cursed, maybe "Demonized" Lol.. That, or the shops that put their hands on it ripped me off. I think the latter is more true. But I do have receipts of all the parts and saw the parts brands they put on, so I don't think they ripped me on parts.
From your side of the story, you were ripped off by the shop. Period. They took money and didn't deliver. It is getting harder and harder to find old school mechanics. With the Loc rear end and if you have drag radials, it may not spin the tires at all (that's what those things prevent, wheel spin). However, you said after all the "upgrades", it performs no different and that's where you were taken by the shop. If you have no interest in at least learning the bare basics and a 200 dollar tool collection which would include a timing light, then I agree, you are better off selling it. Good Luck with your sale