I might go in a different direction. There are some Dakota fans on this site with more knowledge than I have. Some of the early Dakotas came with carburetors. An intake manifold swap may be necessary. 273 carb might fit? A 70's alternator with an electronic regulator would be an upgrade. An electronic ignition system from a 70's V-8 SB. might be modified by changing the star wheel [reluctor] in the distributor from an 8 point to a 6 point. And swapping in a 6 cyl distributor cap. This is old school thinking. Or, an aftermarket ignition system might be available. You can always keep the 273 in there and leave out 2 spark plugs. Then tell people you have an 'uneven fire' V-6.