If I were in your shoes, I'd do the wiring first. The Painless kit is the bee's knees, but it ain't real cheap. Although after it's finished you'll never be sorry you did it.
My old CJ5 with a 232 ran great with the one-barrel. My 258 runs a little stronger, yes, but there are a lot of reasons for that, other than the carb (more cubes, fairly recent rebuild, DUI distributor).
There's only so much performance we're going to get out of low-rev six bangers anyway, so my mods usually trend toward reliability/capability.