I just found this thread so this is a very late post but I figured my experience might help someone. I bought a Clifford package a couple of years ago for a 261 which I just got running.
Clifford sold a Weber-Redline package. The trick with aftermarket EFI is that it is not that hard, but it requires for most of us a totally new knowledge base. So you need either good documentation or good tech support. Documentation that came with the EFI was very weak. Clifford could not provide any tech support at all for the EFI. Redline felt it wasn't their responsibility being the wholesaler and made it clear they weren't happy getting calls from Clifford customers but after awhile, they reluctantly stepped up and were pretty helpful. The software that tunes the EFI is unstable so you waste a lot of time with it crashing.
Redline sent me a base map they did for someone's 235. I had to debug and reformat the code but eventually loaded it and the car runs pretty good. Once I get other car issues sorted out, I'm pretty confident that I can use the Redline software (even with the crashing) and fine-tune the system.
The throttle body seems like a nice mechanical piece. So far, the driveability and responsiveness of EFI is as good as I hoped.
For what I paid, I was owed much more than what I got.
Bottom line is that aftermarket EFI has the potential for better driveability, performance, ease of installation, and ease of tuning compared to carbs. But it all depends on the companies spending just a little more time improving the documentation. And so far, they're not there.
-Dan
