273 manifolds

Dave, I'm not sure if either the magnum manifolds or the block hugger headers will actually fit on the pre-67 Darts/Valiants. I've read a lot about how they should fit, but haven't actually seen pictures of, or heard of anyone that's actually gotten them to work. This time around I'm going to try and build a set of headers of some type for my application because I hope to get my 360 to the 400 flywheel HP level, and by that point, the 273 manifolds will obviously be a major restriction and HP limiter. Not exactly what I'll be looking for after building a good street engine. :)