I've used the ProComp head before. I prefer to buy them bare and them buy the parts to assemble them from Competition Products so that I know exactly the quality of the components used. They will need a bit of hand port work, especially the exhaust side as those #'s are rather low.
I have bought other stuff from Skip without a problem, just never heads, so I don't know how good of parts he uses to assemble them, but he claims they are good pieces. At that price and from looking at the ad, you are going to have to pay a bit more for an valve and spring upgrade, as the valvetrain parts won't be correct for your solid roller cam.
This is the straight plug CNC'd chamber solid roller set up - http://cgi.ebay.com/ebaymotors/SBC-C...item56425ff711
Price reflects the better parts needed for solid rollers.
You may be farther ahead $$$-wise to buy the bare castings, then valves from Competition Products, and move the springs/retainers that match your cam from your current Edelbrock heads to these new castings.
Or this set from White with .710" lift hydro roller springs and just swap springs/retainers with your Edelbrock set...leaves you able to sell the complete Edelbrocks or use them on something else - http://cgi.ebay.com/ebaymotors/SBC-C...item4cf4e44d5e