Not a single backfire! This thing is all but dialed-in. Not having mufflers on would make it hard to fine-tune the rockers. But try as I might, I could not hear much knocking of the rockers. Although they should be darn close as we went through the rockers a couple of times prior to starting it up. The distributor will ground out and stall the engine if we connect the tach, so I'll need to trace back the wire to see if it is grounded somewhere.
THANKS FOR THE HELP, MATT, SCOTT, and the crew on the Corvette Forums!
Enjoy this video clip! (If I can get the link to work.)