Large Test Club 8 Bolt - Engine ID Inquiry

[v8sharkie]

If possible would like to identify which engine this would have been used on. And secondly, if anyone might have ideas of the manufacturer, that would be a bonus.

I checked the Hub PDF and did not see a match.

DIMENSIONS:
Test Club Diameter: 47, 3/8"
Hub Thickness: ~6.25"
Hub Diamater: ~10", crush plate diameter 8.25"
Hub Bore: 3.75"
Bolt Circle: 7"

MARKINGS:
Stamped on back
48428
61
(each blade is also number stamped)