Drag racing may not be your thing, but, I GUARANTEE that engine isn't happy with a 14:1+ AFR at full throttle at EITHER end of the pull. Your engine should make decent power to 5200-5300 range, I've had the same basic cam in the same build and it ran 102+ in the 1/4...
It DOES NOT need bigger valves, heads, camshaft or any other mechanical stuff other than getting the fuel curve squared away. That much of a mess in curve could be 50hp.
Pick your parts, pay your money.
