Depending on how extreme the build. I prefer to reverse cool. If the block is not filled with concrete I like the core plug adapters to deliver water at the bottom of block. It is proven better cooling. Borrowed the idea from Sprint car applications. The R5 actually has a passage cast in the block just above oil pan rail.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
