I used a locked out lean burn unit when I put in my Megasquirt. With most of them you don't necessarily need to let the computer control timing. It is very handy to be able to dial in the timing to 1/10 of a degree, but I've found the base timing map is generally sufficient for me. As always, there are a few tweaks that can be made. Timing won't really affect driving over the pass here. Unless you are spending a significant amount of time at 11,000ft, it's generally up and over then back to a more regular altitude. I haven't noticed a significant change in vehicle behavior on the wideband o2 when I've been back and forth. Pretty much set it and forget it.