Motor/ mid plate suggestions for r3block and Reid case power glide

A body said
I’ll have to recant that statement.... motor plate (between pump and timing cover should be ok (same), it’s where the timing cover meets the block where you run into differences..... the 9.0/9.2 deck require the unobtanium “Arrow” timing cover, or in the case of belt drive a spacer/adapter. Sorry for the wrong statement.... this stuff still makes my head explode. I have a 9.20 deck W8 we run in the car, and a 9.0 deck W8 mill on the stand.
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I just had the water pump gasket matching them up.the holes line up.except the 2 that are rt beside the outer water pump bolts going thru the timing cover. I'm reading what I can find about the difference between the la/r3 . thanks for your help. I'm sure I will have a few more questions..