Hi,Wrench Fetcher,sub-frame of Firebird front end blocks part of standard pocket for battery; WE b OLD, I will check out the gel battery, have to buy new battery soon for this project; I can't picture it fitting on firewall but it might be good for remote battery box;I am making cables out of welding cable, it has four wires in it,and I am sodering on terminals,is this o.k?