Eventually, the plan would be to swap in a 4.0 and the overdrive auto.... but for now, the 258/Torqueflite will do nicely. But, I think Holley has come out with a Sniper-style TBI setup that will mate to the BBD flange. Mostly for the Jeep people, but I've got a friend in Wa. State who did the swap on his SX/4 and said it worked very nicely.

I'm no stranger to the BBD. Lovely little carb if you ask me. My Swinger was a Super-Six with the BBD and I winter drove it for the better part of a decade.

My Gremlin has a Carter WCD and one winter it got so cold, the throttle shaft was stuck tight. I had to set the choke by hand to start the car. Sat there for 10 minutes idling before I had a usable throttle.
That was also the day the car tried to kill me.