And where do I find all these 318 small port closed chamber heads? Are you hoarding a huge stash of 273 heads in your chicken coop? 302 heads are fairly easy to come by and offer advantages. I have owned no less than 12 cars with 318's and the 2 I have have now using 302 heads run the best overall and on 87 octane (real daily drivers) WTF do you drive everyday? or can you even move your 400lb *** off the couch? I would like to try Magnum heads on 318's but more $$ to set up may as well just start with a 5.2 or 5.9 then.