You can run the engine without a turbo without any problems. You can also run additional timing with the low compression engine to gain some of the lost performance caused by the lower compression. Most LS1 type engines can't handle but about 24 degrees of timing before they ping but with the low compression you'll easily be able to pull about 28 degree or more. I don't think Calico will coat your pistons for you but you can ask them. You can do a little research on the net to find places that will coat the pistons for you. You may be even able to get the company that supplies the pistons to you to have them coated before shipping them out. Speed Pro and Mahle both sell a coated piston. Do some research and don't be afraid to call or email the manufacturers for more information.