I selected the Edelbrock Pro-Flo for my big block EFI in my 69 Vette. I like the fact it is about as simple as it gets. Granted there are fine tuning items that are not available and a complete engine system change would require a new base cal chip to be burned. However, from there is it simple plug and play. I love the hand held tuner control box that makes real time instant changes and displays engine function with a green/amber/red indicator light to see rich/lean at a glance while cruising.
On my LSX project in the 69 Camaro I am really on the fence. I made some major mods to the car with SLP Stage III heads/cam/35# injectors/2,800 stall, etc. SLP uses Fastchip.com to program for $450 a pop. I think they lock the program once complete. They have a good reputation with SLP and seem to be confident of producing good results the first time. The other option is to go with hptuners.com or other type source to be able to log in and tune it myself. The problem here is they do not supply any baseline info or basic programs to get started. It is all learn as you go.
So, to answer you question: Yes, I do mess around with this stuff, and NO, I really don't like all the time and effort to compete the fine tuning details.
As far as chassis harnesses, I have done the Painless generic gm 18 circuit many times now. It is true you have to come up with your own ends from your stock harness for blinkers, tail lights, etc. However if you are running aftermarket gauges, a/c, and stereo, you will want to build your own ends there anyhow. It is very time consuming and requires thinking through the entire electrical system as you go always leaving room to grow as you think of additional things as you go. Tieing into a EFI system is a breeze as you usually are only integrating ignition, battery, grounds, and coil power.
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