Dremel.... that'* not gonna work too well on the cast iron front. and to port the rear, you need to grind out the welds inside the ports and re-weld them on the outside.
I'm gonna try and sell mine in the spring for $175 plus shipping *shameless plug*
I've got a zzp ceramic coated rear manifold(all the real porting done to it) and crossover and a WPI front ported manifold with black high temp paint.
I think zzp has thier manifolds on backorder. But you can get good high temp painted ported manifolds at http://www.winterhalterperformance.com/