Damn, usually a bunch of Negative Nancies when someone wants to port a cyl. Even have a site sponser being positive. Though you might not achieve Dick Measuring Dyno numbers, don't be discouraged.
As Young Gun mentioned, those templates make the intake bridge to narrow for my comfort too.
A search will/should show timings relative to port styles, ie, drag, dune, trail, etc.
Besides McDizzy site, Gorden Jennings and H. Grahmn Bell, along with available comp programs for port timings, etc..
Pasi S. and another from Saudi, (or somewhere middle east) have sucessifully done own porting (most recently) and have some pics, etc.
Good luck and let us know how it goes.