Newest parts acquisition & a Question

[1969 GMC]

Hey guys,
Yesterday I snagged myself a new transmission. I got a free divorced NP201 transfer case a while back, so I thought I should look for a 2wd tranny to go with it, since my SM465 required a total rebuild.

Anyway, its a New Process 542 GL. Five speed with direct in fifth. No Overdrive, I know, but it does add that much needed gear between 3rd and 4th on the SM465, so it should 'drive' much better. It also has an even lower granny 1st gear (7.33).

It was from an '84 Chevy C60 school bus chassis. Originally had a tall deck 427 in front of it. Has a humongous bolt on ujoint flange on the rear, I think its a 1410 series. It also doesn't directly bolt to the engine. The Bellhousing has an SAE pattern, but there is a thin steel adapter to the Chevy pattern. It has a monster 13" clutch that is heavy as crap. I think it will be a nice bulletproof addition to my truck, eventually that is. I know, world's slowest build up.

Here's a pic:


My question is, can I use the flywheel that came with this tranny behind, say, my 350? Its from a TD427. I know I couldn't use one from behind a 454 due to the different balance, but what about the TD big block?

thanks in advance