Okay. All that work has been done. ITB's are way easier! ITB's can be run bank fire (by alternating the injector sequence from odd to even), or sequential, but importantly, even if they have six injectors, they don't have to be port EFI with welded in or drilled in bungs. That makes a port on port set up hugely easier with MegaSquirt 2 or 3.
If going it alone, you need to find better people and companies who will work with you rather than guiding you down THEIR preferred path.
Choices are about what you want. In my humble opinion, side drafting an in line Ford small six is not a great idea. With side draft Webers, you cannot match the efficiency of a correctly set up & calibrated MAP system from an unleaded gas 185 to 216 hp 3.9 or 4 liter six from 1988 to 1993. They were down drafted in the 1984 to 1992 EFI x flow 4.1 liters, and then up-drafted for the 88 to 93 OHC sixes.
Since 1984 to 1997 in Australia, EECIV was Fords chosen way to integrate ignition, EFi and meet emissions and reliability requirements, without a MAF sensor, and just one really big 70 to 75 mm throttle body.
Moving to a Weber triple carb system, well, it can work fine, but probably not in a cramped engine bay like the Vintage In-lines intake and Falcon has. No real room exists.
Normally, switching to an aftermarket ecu will bring huge and completely unnecessary cost, both in hardware and tuning. Almost certainly won't drive as well as a stock Speed Density EECIV EFI from a 4 liter OHC Ford. Again, either V6, or the Australian 3.9 or 4 liter OHC from 1988 to 1993 always gives good results, and you can ITB it.
Since the USA just doesn't have as many hard core 4 liter in line six Fords, you have to decide if you want to triple Weber it or ITB EFi or go to some less than ideal stand in non port Throttle Body system (EZ EFI, FITECH, Holley Sniper
et al ) which has a whole bunch of other issues, especially on an in line six.
a91what "SendMeUrDataLog" does it all for ITB's from base maps, and he's done everything with a M52 BMW ITB on Mike1157's 4.1 Maverick engine.
So that's everything from normally aspirated 3.2 liter to unturboed or turboed 4.1 liters. 195 cubes to 250 cubes, boosted or non boosted. Big cams or little ones.
The cross over point is easy, GM did it first with its speed density TBi for years and years. GM guys provided the 3 bar MAP sensor, the rest is easy.
Turbo
https://www.youtube.com/watch?v=RGvzTMlJ3-U
[bbvideo=560,315]https://www.youtube.com/watch?v=RGvzTMlJ3-U[/bbvideo]
Non turbo
https://www.youtube.com/watch?v=7T_tM-FYwnI
[bbvideo=560,315]https://www.youtube.com/watch?v=7T_tM-FYwnI[/bbvideo]
And the first day out with ITB'S and no turbo and an a91 what? Stevie MegaSquirt tune...
https://www.youtube.com/watch?time_cont ... b37v0Zb6lA
[bbvideo=560,315]https://www.youtube.com/watch?v=Vb37v0Zb6lA[/bbvideo]
Easy.
Three DCNF style ITB's from Jenvey or some ATB400's from DellOrto or Weber, and you don't even need anything other than a log head to mount it on.
ITB's are way easier than single throttle body systems.