However, please make sure to do your research. Some of the mods from "the good old days" were actually not all that great. I, along with a number of others here have either done and/or unfixed a bunch of these types of mods. 3 leaf rear spring, sure. 4 leaf rear spring, sure, no rear spring and coil overs, sure... The battery to the trunk is actually pretty easy to do, but first I guess I need to know why? The newer batteries, especially a lithium Ion are so light that you would probably add weight to the car with the amount of cable running from the battery in the trunk to the starter up front. If this is going to be anything other than a pure race car, then I would leave the battery location alone and focus on other items. Just my rambling thoughts.