Small block bell with a 4.8” hole; what’s the app?

54CB1317-C70E-4407-8865-F0CDE41D2B6A.jpeg Just picked up a small block bell housing with a 4.8” bearing retainer hole. It was cast in 70; partnumber is rubbed off but starts with 2 and ends with 482...I assume it hasn’t been modified...could this possibly be from a T/A or AAR? I do believe that they had the big block (4.8”) bearing retainers...fact or faked?

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