1972 Duster Project - Back From The Pasture

Been cranking away here. New shocks, rims and tires, u-joints, tail shaft seal and exhaust system in. We took it for a mild test drive on Father's day. We'll take it for the VIN inspection next week then strip the bumpers and rims off then finish the body work, disc break conversion / steering re-build.
The engine pulls very hard but there is a fairly loud whine coming from the tranny only under load. A-230. It was flushed and refilled. The old fluid looked normal and there was plenty in it. Originally I thought it was the throughout bearing but it stops when the clutch is depressed. Any thoughts? Input shaft bearing?
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What size tires & wheels did you use?