Hey guys, I have a 71’ with a 350 (not original) engine with HEI. Just reinstalled the body to the frame and when I turn the key to start the engine it starts but when you release the key from the start position it shuts off. Tried bypassing the ignition switch and hot wiring it but it still does it. If you keep the key turned to the start position it will stay running but obviously the starter doesn’t like that. Any ideas?