junkyard 360 magnum? big block?

magnum's use a bearing in the register that the torque converter fits in instead of a bushing for manual trans applications
problem is the crank may not be drilled deep enough for the input shaft of an A-833, so you will need to check that, you can however use the late style bearing with the A-833 trans
you will also need a flywheel balanced for a MAGNUM 5.9 / 360, a regular 360 flywheel will not work,

http://www.mopartsracing.com/parts/trans.html