Fast sysytems work fine.
There are many EFI systems you can use,some really pricey ,others pretty basic & practicle.
All depends on what bells & whisles you would want.
Whenever I get around to it,,,,hmmmm,,LOL,,,,I will be using an SDS system.
http://sdsefi.com/I like it because you do not need a laptop to do any realtime changes. You imput the changes on the handheld programmer display.
Just like the compushift controller for my 4L85E,no laptop required.
http://www.hgmelectronics.com/products/compushiftMBHD