I have been experiencing problems trying to restart my '61 Rampside. 80 hp/3 speed. After I have driven it for awhile and turn it off, it will not start for at least 20/30 minutes, after it has set for awhile. The carbs are stock and has a manual choke. Why is this happening and what can I do to correct it?....Would spacers placed between the carbs and intake help? Thanks for any help. George ACORN's