Re: vac adv connection ?
I switched mine to ported after reading the first page of replies on that post. It seemed to run great for a few days and then all hell broke loose. The idle got really screwy, constantly diesled when I tried to shut it off, loss of power and bad milage. I was surprised because it seemed to run so well for the first rew days. Then a few more people added to that post and depending on the ignition and distributor used, manifold was called for. I also havef an 88 with the 258 and it came from the factory with manifold vacuum to the distibutor and now it has it again.(the more I thought about it, I remembered the vac advance on my old 350 was manifold aswell). Good luck.
'88 Sahara, 4.2, auto.