engine dyno?
 

Just wrapping up a 3.0 engine rebuild with new rockers, p&c, etc. The body still needs work so I'm wondering if it doesn't make sense to break in and adjust fuel injection & timing on a dyno - if we can find one within a day's drive from Boston.

Average engine dyno job the clock starts ticking from the second they start installing it on the dyno, this can take easily a whole day. Then the dyno time and the removal.
Six hours would be the absolute minimum if they are already set up to do 911 engines, 10-12/hours if not wouldn't surprise me.
Fees depend where you are, but I'd say the average is around $125/hour. Some charge a fee for installing the O2 meters, good guys will want an O2 sensor on every cylinder.

I've heard of guys doing it cheaper, but be aware an inexperienced operator can damage an engine and give you dubious dyno results.

Chassis dyno much more economical if you can wait, though engine dyno is sure to be the gold standard when trying to wring the absolute maximum out of a tune.

If you are running stock CIS, I think an engine dyno is a waste of time and money. You already know what the CIS and ignition timing should be, and you don't need a dyno to figure that out or achieve it. Don't necessarily need a dyno at all. If you just installed a nifty EFI and crank fire system, then a dyno makes a lot more sense. The engine will break in just fine on the street while you are enjoying the car.

Thanks for the advice

dell..