Leaking Thermostat Housing. Thinking on billet with O Ring

This is what I got. https://www.summitracing.com/parts/cvs-tsh8cl
First I cleaned up the intake manifold (Edelbrock Performer) with denatured alcohol, then block sanded the thing with 120. Filled the two extra smaller mounting holes I didn't use with Aeropoxy to prevent leaking. Put the waterneck on, and adjusted the angle, put on a new hose and I was up and running.