I think I'd be looking for another deck. It would cost a bunch to fix that deck up and there are enough good (not rusted through) decks around that you will wind up with a better end result I think.
Try to find a 44A deck, otherwise if you get a 44C, You'll need the 44A center pulley to use that deck on the 1450 (I've got the exact same combination--44C and a 1450-- and just changed pulleys. It speeds up the deck and improves the cut and matches the 3/8 belt much better. You'll need a different belt as well as the pulley on the deck is smaller.)
I'm pretty sure you can buy a very nice deck (consider a 50A as well) for the cost of 3 new spindles. If you do decide to keep the deck, you can swap out the center pulley pretty easily to make it a 44A.
Good luck
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