Exhaust Manifolds

If you search here, all that has been discussed. All the numbers and any modifications to do. The only reason for the Jeep manifolds is because the right manifold exit is close to 2 1/2" . 67-70 340 manifolds aren't a issue (if I have my dates right)
Jeep manifolds? I don't think that Jeep manifolds will fit a sbm. And the only Jeep that I know of that has a mopar V/8 is the 4.7 and from what I've read those won't work on a sbm either. If I'm wrong here and I very well could be, what year Jeep manifolds fit a sbm? And do both manifolds fit? The whole idea of this post is what if any truck exhaust manifolds or car for that matter flow the best, this idea was for a budget exhaust system that would help over all performance and not break the bank account. I've seen Doug's headers on a dart sport but they are like $900. If I can get the duster that I'm going to look at it already has headers, the other one doesn't have headers and I was just looking for some better flowing exhaust manifolds. What would be good mufflers to run?