exhaust woes ......1973 340 into a 1965 barracuda

I slightly ported the exhaust manifolds on the top and sides for the larger ports. I ran J heads that had the larger exhaust ports. The later 360 heads had smaller ports, but had a longer "face" for the EGR port. That face can hit the drivers side exhaust manifold and crack it, so check it before you bolt it on. Be careful grinding on the "face" of the head as there is water behind it. I'd grind as slightly as possible on both the head and the manifold so it just fits with the exhaust gasket.