I've got a spare non-integral head so I'm ok there. As far as 700 vs 2004r I have a 99 tow beast so this would be a driver, and I'm light footed so the 2004r would be fine. I had good luck with my 2bbl rebuild in my 82 but agree the integral head is junk.

Have you given any thought to TBI on the 230? Would have to swap the ECM ($40 ebay) injector to 4.3 and figure out the distributor. But since your truck is already TBI you have 90% of what you need. Supposedly this gives a tremendous boost to low end driveability.