I ttt a thread down below that shows the 12% larger 250 pump on a 200. There is no high volume or high pressure pump for the 200. Sometimes you can get a few extra pounds if you shim the spring. Best thing is to use the 250 pump with a larger 302 performance pickup moded to fit. to mount the 250 you have to slot the pump holes and drill and tap a new hole forward of 200 on the block, there is not much room, pan needs a bump out and pump needs trimming at the rail or the pan at the rail, the oil passages as you can see on the sawed off pump flanges need porting for flow. Drive will need to be shortened.
The adapter fixes a lot sketchy of stuff. The alignment sleeve can be pushed out of an old pump easily and be used on the new adapter. I made this one taller than I needed but the block of AL I had was already parallel but it is hard to make short because everything is to close to make work easily, there is probably a way, but I wanted to lower the pan to get oil away from crank. This adapter is very stout and is larger than the pump for more stability at the block. The pan depth at the pump and pickup will need to be deeper. What is nice about the adapter is no mods to block so I can move to another block with no mods, just bolt on.
A few other things I do is, I have to use an 90 oil filter adapter to clear the steering shaft. I drill and tap some ports on the clean side and run a line to a separate filter for turbo and the other a 3/8'' line to the rear side oil port, what that does is feed oil to the rear crank bearings, rods, rocker shaft oiling, I do this because the oil galley is drilled from both ends and they do not line up well cutting good oiling to the rear, plus it is a long ways small, it also does not help that the lifters they sell block the passage more. Do not use oil through lifter if you do not need them unless you block the oil through. It would not hurt to shim the 250 relief spring with a .062 washer if you would like a little more pressure. I would feel comfortable with a short adapter if it was made of steel, use allen head bolts for adapter and allen set screws for studs for pump hold down. It would need to be tall enough to get the oil ports aligned ok, oil pan at rail would need mods.
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