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I recently pulled off my intake and exhaust manifolds on a 225 slant six so that I could paint them plus the engine and when reinstalled, the engine seems louder and has a choppier idle. I replaced the all gaskets and installed a K&N air filter. What could be the problem?

I have a 71 Duster with a 225 slant six and was planning on swapping in a 360. Would purchasing one from one of the various remanufacturing companies be a good idea? Also would the current 904 be able to handle/bolt up to the 360? Thanks.