63 dart exhaust manifold

All the aftermarket ones I've seen are awful but unless you go with headers, they're about the only game in town. Finding a good used one is another option but determining if it's good before you buy it is the hard part. If you get a replacement, search here through the many threads on this subject so you can verify you have the correct fasteners and are using the proper procedure for installing it. If you do it wrong you'll be looking for another in short order.