Skip those Lean Burn distributors with their dual pickups and weird phasing and just use a stock distributor out of the TBI roller engines of the late 80s/early 90s; or ANY Magnum distributor. "Giveaway" dirt cheap and parts are available everywhere.
I've got a box somewhere with a stock distributor out of an '87 Fifth Ave with a roller 318. I haven't dug it out yet, but should be single pickup and not the goofy dual pickup distributors from the earlier Lean Burns. That was what I had in mind.