Thanks for the tip on the RPV in the front. I did a conversion on my 67 malibu and just added the prop valve and a RPV in the rear and it works well. If you look at the Speedway catalogue it says to use one in the front ckt but I am not convinced. IIRC its 10 psi rear and 5 psi front. They are easy to install so if needed I can put one in at a later date. Thanks again...