67 twin turbo dart

They were just trying to tune it now that the crank signal isn't dropping off. Current info:
Even without any load on the dyno it has a hard time accelerating, like it would feel if the brakes were applied the whole time. After a run though the rear brakes were cool to the touch.
Sounds like the timing is severely retarded. I hate to say it but trusting your car at a dyno shop is a recipe for disaster.