driveshaft alignment

[bayalfagtv6]

Okay, this week I'm going to put the transaxle back in my 83. Question I've got is to get the driveshaft in good alignment is all that I have to do is loosen the pinch bolt at the front guibo ala greg gordon and idle to rev a few times or should I leave more loose, deion tube bolts, etc? Driveshaft has been completely rebuilt with all new guibos and has also been balanced.
thanks for the input.