There is another angle to this that is a bit advanced, recently the megasquirt EFI (MSII) module had a variable fuel sensor added to its operating software this allows it to detect how much ethonal is in the fuel and it will automatically adjust the mixture to suit. If your running a 1 BBL rochester on a 216 then a 2 hole TBI off of a late 80's 3.8 V6 will fuel the engine fine. For a 235 or 250 then a TBI off of a 4.3 V6 will be good. These parts are showing up in late 80's early 90's astro vans that are now being junked regularly. Or you could use 2 1 hole TB?I's off of a 1.8, 2.0 or 2.5 4 banger if oyu have a dual 1 bbl rochester setup. As oil continue to increase more ethonal will be added. So this issue is not going to disappear.
