Exhaust manifolds on my 273

On the later head's such as 302's they are very thin so be careful grinding on those for the clearance you need,maybe a lil' bit and some off the manifold and a double gasket.the 340 hi po exhaust manifolds are what I used on my 64 dart years ago,they flow a lil' less than headers.you will also need a 90* oil filter adaptor if you use those.