I don't have Weber Alfa but I do have Autronic SMC for my 75 3.0. No air flow meter. Big 4 inch pipe from a 6" cone filter feeding the GTV6/75 V6 style plenum. Enlarged the inlet runners from 34.5mm - 37.5mm.
If anyone needs some good base maps for aftermarket EFI, I think I can assist. I have a wideband Lambda meter as well. Stephan Lenoir helped give some hints on where I should start, especially the ignition advance.
For my 155 V6, I have the squadra chip but everything else (besides the 2.5" exhaust piping is stock) is stock. Haven't measured the 155 V6's inlet runners, but I think they are about 36mm. I think the switch to the 164 QV 24V runners would be excellent, but I'm not sure of the runner length, will it fit?
Also since we V6ers have the flapper AFM (which basically sucks unlike you 16V owners), I'm thinking of using a bigger AFM from a 164 QV 12V. I like the squadra chip and decided that the programmable management will only be for the 75 racer. Besides, can't afford two of those systems...