loose torque converters (especially with hi-torque engines) and chassis dynos aren't always a good mix. stock rockers can give too much preload on the tappets and I don't think those edelbrock springs are up to snuff for that cam. you probably have a coupe of, if not more, issues to look at.
His converter isn't too loose. If anything it's too tight.
I just watched a video of monza from street outlaws with his car on a wheel dyno. You can hear it go up on the converter.
High torque and chassis dynos are done all the time. It's not the dynos fault.
