I have a late "51 I just picked up. Where any of these the 281 engines, or didn"t any of them get out until 1953? Next, it has some leaks I plan to tend to. The belt pulley takes up a lot of space by the hydraulics so I was thinking of removing it as I do not have a use for it anyway and blocking it off. This does not affect my hydraulics in anyway does it. And last, I have access to a live pump from a 400. If I installed that, what all would need to be done to make my system live? Do I need to change something with the belly pump, or remove it, or???? Thank you in advance for any imput.