I've heard of guys switching over to the GM TBI set up...no shortage of aftermarket for that stuff, but if you go to that point you may as well find a 92 and later van and throw a Magnum engine and harness in it, but it's kind of against why you are buying the van as it only has 40,000 miles. I had a 90 Ram with a 318. I put a set of dual exhaust and it had no ill effects. I say put some headers, dual exhaust, maybe even a 4 bbl intake with an adapter for the TB and see what happens.