Check out the top of line Holley stuff, It comes with the wiring, ecu,WB's, software and start up tunes. You will not need to be a genius to install.
A good hot rod/ tuning shop will be capable if you are not comfortable. The real plus is that it will all be new and un butchered, And the cost of tuning software and extras are ALREADY their.
IF you decide to tune the factory ECU, you will need $ for tuning software, $ for a piggyback, $ for WB's and $ for expert advice. And I will add that anybody that has any real experience with tuning the OLD original ECU and does not see the limitations and problems both $$ wise and age related Is either VERY lucky or has little experience.
The latest project I am involved with is an 86 fox that I converted to a 96 F150 OBD2 ECU. that's a 60 pin to 104 pin conversion. I would NOT recommend this to anybody, and I will not do this insanity again.
Don't get me wrong, the 96 ECU is a much better processor than the older stuff. So since I have all the $$ invested in the tuning already and have some experience , it was logical ,,,even if not smart to do so.
Cost wise , I will do the Holley route next time. My 2c worth