I'm now sorry I asked the question. I know plenty of FGFers have done all this before many times, and never had balancing issues. I meant to ask last year when I had my original flywheel resurfaced.
A month later a good Ford Fairlane friend of mine stopped by, and I explained my recent work on the bird (new clutch, rebuilt tranny, resurfaced flywheel). Well, he immediately acted very concerned about the whole job. "Did the machine shop balance the flywheel to the engine?" he asked.
Uh, "no, I just dropped the flywheel off and picked it up a few hours later", I responded. That left him very concerned about the internal/external balances between the engine, tranny and flywheel/clutch. I tried to calm him down with talk but finally had to offer him a few dark German brews to get him back down to earth.
I was using all original FGF parts and pieces to the bird, so I wrote it all off as "FGF pontiacs don't have that concern".
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?