66 273 Cam and Intake Thoughts

Clint, if the heads you have now are the original 273 castings, you don't want to use the TQ manifold from the '74 360. The ports are much larger than the smaller 273/318 heads and will create a very bad reverse step that will cause turbulance (resistance to flow) in the port runner. Best to use one of the aftermarket aluminum manifolds for that application. Or a 273 4 barrell casting, but I believe they were square flange manifolds (AFB) and not spread bores. Others can help you more on that one. Good luck, Terry.