I had the TPS set at .96. It was dead easy to set the voltage on the Sport. No widening of holes or anything of the sort. Idled smooth as silk and ran like a top....until I played with cruise. I researched the heck out of the issue. I'm not really clear what you mean about setting the "kick down", but I tried all sorts of methods, including "re-learning the idle" (sorry, I tried to link the website I used but it's a dead link now). I asked a lot of people in the know and just couldn't find answers. I did come across others that had the same problem. One thing I did do that minimized the problem was ditch the thin paper gasket I got with the BBK and used the OEM "gasket", that plastic spacer with the fins in it. I used a Dremel to bore it out a bit to match the 70mm diamater of the TB. This not only picked up some of the slack in the throttle cable because the spacing was closer to OEM TB but it definitely made the cruise perform a bit better (but not perfect). I was able to hold speeds better on flat ground, but it stlll lagged about 2-3 mph on hills. Even more on steeper hills.
I still feel that overall, the mod did little to enhance performance. I felt a bigger change when I switched from an OEM MAF body to the larger offering from C&L. That "increase" (if not only psychological) was not huge either. Aldive and Doug (Bama) have dyno proven that the C&L does have a benefit. I still use the MAF on my 5.0 application. I have yet to hear/see of "dyno proof" that the larger TB does anything in the SOHC.
For the benefit of others, please tell us how to adjust the "kick down". Maybe that's the solution. When I posted on this site about the problem, no one came up with that suggestion. As mentioned, Aldive did the exact same mod and had no issues whatsoever. I tried two different throttle bodies and had the same problem and I know of others that had similar issues as I did. I don't really care anymore because I've got a 5.0 now. I scored an OEM TB off eBay from a guy who has done porting/polishing for years (former drag racer). I asked him if he'd do a 5.0L TB off an Explorer and he finally did. I did notice a slight performance gain when I bolted it on and MUCH smoother throttle response.
With the SOHC, I still feel that simply bolting on a 70mm TB designed for the 4.6L Mustang provides marginal gains and unless you're getting the TB at a sweet price, it's a mod whose cost well exceeds any perceived benefit. That's my opinion only. I'm sure others will beg to differ, but until I see dyno results, then those perceived gains people claim are just that, perceived. I researched these TBs for months and even Mustang owners tend to debate the benefits. Many feel that without the right mods simply adding a 70mm TB does little even for their applications.
Ok, maybe I am not helping things.
