I think that any of the main brand S/C’s out there are going to make you happy.
The trick is, to find a kit that includes the hardware to add additional fuel to make it go.
Not many stock ECM’s can deal with a two or three bar MAP sensor. So, unless the kit has some way to figure out the fuel needed, it can become a problem.
That is how I ended up with Electromotive. I started with a Tec II. That was a direct result of getting pissed off at a “Tuner” that was making changes to my OBD1. I was making so many trips back and forth to his shop to have changes made to the program, I figured I might as well do it myself.
There are lots of options now for OBD2, but not so many for the older ECM as you know.
As far as ¼ mile times, I never raced the Hoe with the S/C. It was just the tow vehicle for the Z28. After the twins were installed, I would unhook it from the trailer once in a while and try it. Something would always go wrong, so I never had a “clean” run. The best it did was mid 12’s at a 110. I blew the trans on the next run, and have not had a chance to get back to the track since the 4L80e took the place of the 4L60.
I may sell the Z28 and concentrate on the Tahoe this year, not sure, have to wait and see. The Tahoe is more fun, because nobody expects it to go like it does. The Z is a couple of hundredths from breaking into the 10’s, but as soon as it does, they have more rules for safety to comply with.