1970 Duster AlterKtion, 4 Link, LS/T56/Turbo and Minitub

You run whatever spring you want your minimum boost pressure to be. I run an 8 pound spring because it’s what came with my wastegate. In my dart I used the original style tank also but I cut a giant hole in the top of it and used a dodge truck sending unit that I switched the pump out of for an Aeromotive 340.