I put a set of use gm extractors on a vp a while ago and they were not to hard to drop in. Nice and short with a bolt up flange on the bottom. A little twisting and in they went with everything in place, later i found the power steering hoses were closer then i would like so i bent the fittings a little.
Morton's prices are about right. I picked up a set of Paceys for my VN V6 for $150, I think. Can't remember for sure, but it was around that mark. Easy enough to fit if you have half a clue what to do with a spanner.