Just wondering if the dyno operator could squeeze more power out of an obd1 pcm vs. an obd2? I know the mail-order tuners say they get get a little more power with the obd1 pcm's not sure if it is the same when you can strap em on a dyno?

 

I think I've seen people who claimed 5rwhp gain going from OBD2 to OBD1 but really don't think it was the PCM swap that caused the gain in horsepower.
If the tuner has the equipment to tune OBD2 then I'd leave it at that. If he only has equipment to tune OBD1, then I'd convert, but I would not do it based on the possibility of gaining a couple horsepower.