I was looking over a couple of old invoices and they are still in business is AeroHead heads. Today you can buy a set of camel humps with 3 angle valve job with screw in studs for $399 for the pair Ready to bolt on!!!.
2.02 or 1.94 valve size.
Add $80 for roller springs and add $80 for hard seats.
http://www.aeroheadracing.com/id7.html
If you don't have heads yet this will save you minimum $150-$300 bucks.
On average core set is $150-$300 about $50 for mag and pressure test,
$300 in machine work-includes machine for screw in studs and still you need the springs for a H-roller. Spring and retainers good quiality $100-$150.
All together About $600-$800. Free up extra $$$ for the roller set up.
The heads I sold from here are still on the customers car and its been almost 4 years with no issues other than going faster. 8)