I need some advice on timing/overheating and starting. I have a 350 gm in a 56 pontiac that runs great BUT after I've had it out running for a while it seems to get hot and will not start again until it cools down which sometimes can take a couple of hours. I've been told that my timing may be to far advanced so I've attempted to set the timing and can only see the timing mark when I put thewire on one of the back cylinders, so I.m thinking the distributed may be out 180 degrees????? can it be out that or can it be out 90 degrees?? the distributer is very close to the fire wall and I don't think it would fit if I pulled it and rotated 180 degrees. When I put the timing lite on front left cylinder the timing mark is nowhere to be seen. Any advise???