What I am saying is that you dont need 12:1 to get a Chevelle into the 11's. It can be done with 10:1 motors on pump gas, its done all the time. I'm not talking about some high dollar motor either, just off the shelf parts available to anyone. If you can afford to build a LS7, then take some time to seek out the right parts. If the plan is to build a motor that sounds cool then yeah, use the LS7, because the huge duration gives it the lumpy sound. IF you want to go fast, use the better technology that we have been given by GM to your advantage. Higher lift, less duration gives better ideal quality, better flow, and better performance. Add a roller cam and increase performance even more. I have shamed many loud and lumpy big blocks in my small block Chevelle with these basic principles. It runs on pump gas, no NOS. I have ran race gas with out seeing any advantages, other that a neat smell. Save your money! Dont spend it on AV gas or race gas, spend it good quality performance technology. No, I'm not it the business, just an avid racer, who got smart by watching those who win. Thats all I'm going to say.