I Have a 65 chevy p/u short bed i want to re-wire every thing but the truck now has an HEI ignition and a 350 in it will the replacement wiring harness (18 circut)do the job. Another thing Every time i cut the truck off and it sits without being stated for about 16 hours the battery will be drained Iv'e had the battery recharged twice but it still happenes, what could i try to do .......thank you