Hi Raymond..
..Van already has some right thrust built in. Just bolt it up to the firewall....he's way ahead. I believe there's also a little down thrust...I think.
What you do want to consider later, when you go to install your cowling, is to level the top of the upper cowling with the spinner since the rubber mounts seem to compress with time and a little engine sag becomes obvious, though not really a big concern.
Regards,