Pete, snatch um up when you can, they may not be there if you don't. I think getting the whole drive train is a good idea. If you are really thinking of using the driveline from the buick, be sure to snag the springs too. If nothing else you can use them for mockup.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)