Dont bother with steen racing, they are retarded there in my opinion (bad experience). Anyway, not many people port and polish too when they do the swap because its not going to give you that much more power unless you are going with a different cam than the stock pi cam.
All in all, my swap cost me about 1200-1300 I think. I paid 800 for the heads, shipped from steeda, pi intake from mustangtuning.com 190, head changing kit 100, misc gaskets from 50resto.com and seanhylandmotorsport.com 50-75. I replaced my water pump while everything was apart, so that was extra and I didnt have a single tool when I started the swap so those were extra. All you really need though is a good set of metrics (deep well and regular) 7mm-19mm.