V8 273 head question

You do not need heads or anything else. I would use the Offenhauser intake. See post #8, just use 5/16 Grade 8 hardened washers. You should also be able to use a newer intake with these angled washers. McMaster-Carr Since newer intakes use larger bolts you may not have to do any modifications to the 66 up intake. Just do not use the standard stock steel shim 273 / 318 intake gaskets with any intake. There was also another thread where a member did something similar.