Thanks.
I ported the Intake manifold at the head to match the gasket dimensions which were taken directly from the cylinder head. I used a 1/4 inch router bit in the Dremel with Router Base to rough it in. Then I smoothed and radiused with a 1/2 inch diameter sand wheel in the Dremel. Finish sanding remains to be done. (drums are coming) Black ABS pipe location was excellent. This was a very fast operation in the plastic compared to porting aluminum or cast iron, both of which I have done. About 30 minutes.
