I did pretty much the same thing. Worked really nice, i can even hear a difference in the exhaust note. Idle sounds much better now. I would reccommend it to anyone that doesn't mind doing this kind of stuff themselves. I still have an extra stock manifold if someone wants to buy it. Or I could port it.somebody was selling a stock manifold and i bought it.
i used a drimmel tool for the ports, then i bought a 1 inch bottle hone for the rest
made it amooth as a babys bottom
not much to take out at all
i ordered a gmpp gasket and did a small amount of port matching
and guess what i have the stage 1 on order should be here tomorrow