Even if they flowed 275-280...... That's still really cheap money.

Similarly equipped heads out of my shop....... new guides, ex seats, big valves, all new hardware, etc..... For $1500, you'd get a nice bowl blend, intake port gasket matched, some intake short turn work...... They'd flow around 260-ish.

As I mentioned in another thread......... It's pretty hard to compete "head to head" with a cnc machine when it comes to porting.
If someone has a program for the heads you want ported...... More than likely it will be less expensive to have them done that way.

As more and more shops buy cnc machines, it seems as though the prices for some of the more basic porting jobs have dropped a bit in price....... As the shops "compete" for the customer base.