Best EFI for a 408?

Self-tuning systems (TBI or port) use vacuum and O2 reading to try and adjust the tune. At idle, camshaft reversion can cause a false lean and the low vacuum confuses the algorithm. But some self-tuning systems allow you to adjust parameters manually if you have a laptop. This works GREAT. Holley allows this - even with the Sniper. When I sell a Holley self-tuning system to a low vacuum customer I include a startup tune that has the idle parameters set for manual adjustment and I include instructions on how to do it.