Got to All Access Tuning about 1000, and signed in by 1030. I was #10 to get on the dyno, but car #8 was front-wheel drive, so he bumped to last because they have to reconfigure the dyno for FWD, and car #9 had some "Technical Difficulties" (blown fuse on his boost controller), so he wasn't ready.
Got the car strapped down, the dyno run began, and the final results were 142.9 HP to the rear wheels, and 161 lb-ft of torque to the rear wheels.
It's anybody's guess what the loss in the transmission and differential are, but running the Red Line synthetic lube like I do lowers the loss, freeing up a few HP, and the Accepted Wisdom / Tribal Knowledge for these cars is that you lose around 10% in the driveline.
So, considering the original horsepower for this engine was 161 bhp at the flywheel, and factoring in 10% loss, the car should have put 144 HP to the rear wheels.
I have no idea how/when/if the dynamometer we used was calibrated to any traceable source, so I'll just take the readings they gave me, and accept them.
All I know is that it runs really well, gets better gas mileage than I thought it would, and is a pleasure to drive.
I'll take that!