if i want to go the cheap way what do i need to get to make the conversion kit and what kind of car i need to look for in the junk yard? i'm looking in a poston catalog and looking at the conversion kit they have an the price is high for what you get and you can get it from the junk yard. do you need a check valve and vapor trap? where can i get the check valve and the vapor trap from? what is the part# for the check valve and what is a vapor trap? thank you for yall help