Manifolds or stay with what I have?

The only V-8 A-body headers I haven't heard fitment gripes against are Doug's and Tti. Neither is particularly cheap, but maybe less than the block huggers and a pro shop to make 'em work. lol

If you have to go back to manifolds, the best ones out there are the 340s. (Photo below) From what I've seen when these things come up for sale, I'd be money ahead to have a pro shop put on Ttis.