i doubt if you would gain any flow from them paul (because the port is angled sideways to the valve, and i think they,re more suited for a highport design where the port is angled more downwards) and waisted valves have less strength eh
oversize valves would probably give better flow gains imo
oversize valves would be good, but i would need to machine the head to prepare for these. I was just thinking as I will be changing the valves soon it may be worth picking some uprated ones as a straight replacement.