Without letting this thread get out of hand...
Most porters will do at least a couple of levels of porting, from the basic job to a "max effort". It is debateable whether a max effort porting is overkill for the street.
You can spend a real lot of money on porting and personally I do not doubt that a person that did NASCAR heads could get 100 hp out of set. This is best proven while controlling all other variables, which most of us can't/won't do. We are not going to port the heads, dyno the motor, and then do a cam and dyno the motor, then do pistons and dyno the motor, etc....
So a 100hp figure for these heads is high, is difficult to obtain, probably can't be done by most people and is arguably unrealistic.
The inidividual I referred to in the beginning did other work to the motor and unfortunately was there when they grenaded it on the dyno.
40-60 hp is probably a realistic number, but again, the question really is how much do you want to spend and where/how are you going to use the car?
I think $1,500 for a max effort port/polish is overkill for the person driving to store for groceries
But there are worse ways to spend money...
Talk to John Pearcey at John's Performance - he's had good luck with a place in CA he uses and can give you some real numbers and real cost.
9/11. So i have no doubt it will sell again. My car is going to be an everyday driver for about 6 mo. down there so I will have to take it easy 
I will e-mail you later Ken.
