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Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
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Used: IMac (27-inch, Mid 2010) 2.93 GHz QC I7 16 GB RAM (32 GB Max) 1 TB HD | Mac-Ave
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How To Use an iMac as a Monitor for a PC
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Using an iMac as a Monitor in Target Display Mode
Amazon.com: HumanCentric VESA Mount Adapter for iMac 24 Inch (Aluminum), iMac 27 Inch (2009, 2010, 2011), LED Cinema Display, Thunderbolt Displays, Replaces Apple iMac VESA Adapter MD179ZM/A, iMac VESA Kit : Electronics
Identify your iMac model - Apple Support
922-9267 Apple Power Cord for iMac Intel, LED Cinema Display, ThunderBolt Display
/use-imac-as-monitor-with-target-display-mode-2260906-705215bd6f3940efbff05dc374e0a44d.png "How to Use Your Old iMac as a Monitor")