Yes it sounds like you're on the right track. Keep the same vb with same case; keeping everything together from the front out of the donor. Just air check the seals and rings and clutch clearance by installing the pump into a vise and stacking the front guts on it. You'll figure out which holes feed which drums. After that, l always assemble the trans without clutches, band, front gasket or pump o-ring; in order to check endplay; considering a pump gasket adds .010 and a hot case will have .020 more endplay than a cold one. Minimum endplay adds longevity to the direct rings.
