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Throttle body would help at very high revs but with a tock exhaust and manifold your throttle body is not the bottleneck in the system. Also a bigger throttle body would need bigger injectors and adjustable fuel pressure regulator I think.  Porting the head doesn't change engine size but it removes sharp restrictions between manifolds and ports and smoothens the flow making a more free flowing and efficient head. Some people also enlarge ports not too sure how much\if you would benefit from that. What you could do is drill the camshaft sprocket so its adjustable and adjust your timing. Look up cam overlap and cam timing on Google to understand what you can do and decide what you want