I used a Top Street Performance TSP 81073 (Holley 302-2 dimensions) on my ’66 C10 build.
After I purchased this oil pan I discovered the Super Shops SS11004 (Holley 302-2 dimensions) pan for less $ on Amazon, now you can find this pan on their website.
There are many other Holley “knock-off” oil pans available now also. Just shop around.
Just a few comparisons of LS based oil pans: