Shaving the head may not work on a Forte without serious modifications elsewhere that will end up robbing power. Lower the deck, you need to shorten your valve lift, otherwise things will go 'bump'. The valve vs. piston tolerances in these engines is very likely pushed to the absolute limit already, so making a change of even a few thou could be catastrophic. Shorter valve lift requires different cams, and the R&D for that is not going to pay off as this is considered a fairly 'obscure' modification to the majority. The ECU would also need to be remapped.
Or, take that thousands of dollars and buy a turbo kit that has had all the kinks worked out... Awfully hard to impress people at the local parking spot by showing them a stock looking engine and telling them you've got $11,000 in internal work to gain 14 hp. Much easier to pop the hood on a polished turbo kit and make 'em sweat - for far, far less money.
As for porting... it's a plastic intake manifold - not going to gain anything there, and the water jackets are SO close to the runners on the head you'll likely not gain too much, anyways. Three hundred years ago this was a great power adder but in this century it's just not the same. CNC and other modern manufacturing processes have forced work like this out the door.
