Run at least 10# all the time. It is safe. 12# on pump gas with a stock motor and a spot on tune is about the limit, but I ran 11# with a really rich tune for about a year no problems. You will save mucho time and fab going with a trick set up over fabing your own stuff, and his parts are quality and customer service is awesome... and yes i have his parts.

I am going to be doing a twin set up with Rick as soon as I get the LS into the 90 model so I really suggest going that route.