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Crank is high in the block in a big block but the oil pan tends to be shallower than a small block. As mentioned by others, if you use a tray, use one with as many louvers as possible. If you are considering a crank scraper or combo, check out the options available from Ishihara-Johnson:

Ishihara-Johnson B/RB crank scrapers & trays/screens.

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I installed one from Ishihara-Johnson and it works great.