I have an 824 with date code D-24-71
I didn't look at the stamp codes tonight. It is a Std 4.125 bore w/factory 4 bolt. I guess that is a little to later a date code for your project unless it is a replacement code.
Adger Smith
Adger Smith Performance Engines
2802 W 7TH ST
Texarkana TX
903-794-7223 shop
903-824-4924 cell
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www.adgersperf.com web site(no mail)