Originally Posted by 81WideMariah

IF you are road racing/autocrossing then ideally you want to keep as much mid range as possible as that's what gets you out of corners faster. Drag racing engines are more concerned with peak HP numbers as that's what increases trap speeds. Also, having usable midrange will help out on those courses where our less than ideal gear ratios show there ugly heads.

So I'd leave the taper. Looking at your ports though it looks like you could stand opening up the ports a bit more near the top/closing edge of the ports. You should have a little more of a bowl shape leading up to the closing edge of the port. I'll grab one of your pics and circle the area in paint in a few mins.