Talk to Weldon Pumps. Just put one of their in line A600-A on my car...self priming and sooo quiet. You can mount it horizontal, vertical, anyway you want.

1968 Pro-Touring Dodge Charger
*2011 Optima Ultimate Street Car Challenge Invitee
http://www.popularhotrodding.com/features/1203phr_1968_dodge_charger/index.html