318 head porting for the average joe

Justin would it really be worth it to clean up the runners, valve guide boss and bowl area on these 318 heads in my other thread if I use the factory 273 exhaust manifolds. It does have duals running all of the way back. Would the increase in flow help make up for the compression that I will be losing by swapping to the open chamber heads?

The only reason why I would run them is because they are fresh, super cheap and have hardened valve seats. I have to tear them down anyway and install new valve stem seals anyway.