Ported Victor W2

An old circle track magazine tech article on manifold and head porting showed blocking each runner and pouring Perma-Flex silithane or blu-sil into each runner entry. They let it set up and marked all the around it every half inch of length to use the dimensions as a measuring guide to equalize the port dimensions. That would be crazy expensive with the current cost of moldable rubber or silicone (I don't guess the NASCAR teams gave two s***s at that time) but you may be able to use modeling clay to the same end for a cheaper alternative. You may have to rub the runner opening to about four inches in down with paraffin beforehand, but it may be a good way to final check how close you are with everything once you get done grinding while using the outside calipers.