TBI Fuel Injection

Cheapest might be a used Holley Commander 950, with the smallest fuel injectors that fit. Even better, get the ECU & harness alone and substitute Holley Pro-jection 2-D for the TB. The Pro-jection controller was poor, in its 3 variations. The original "by MSD" version had the most robust connectors. The designer of Big Stuff 3 originated it, then Holley took over. But not having a Pman sensor made it erratic. I think the last 4Di version was effectively the 950 design. They use GM TBI injectors (both early & late style). The Mopar Magnum V-6 TBI might be a better fit and cheaper, but will need to fab a custom adapter plate. All above need a 4-bbl intake manifold (Offenhauser or Clifford). I have most of the above for my 3 Mopars and bought one Commander 950 ECU for ~$50 on ebay.

But, MPFI would be much better on a straight six, since a TBI still has the fuel mal-distribution problem. For my slant, I am thinking of modding an aluminum intake for MPFI. One guy here (Pishta?) put MPFI holes in the head. Too bad Mopar didn't continue the slant into FI days, though the AMC 4.0L did (Jeeps).