In my '67 122 I have a b20 with twin SU carbs. I parked it a yesterday and it won't start today. It was running fine up until now. I checked and it is getting spark at the sparkplugs and fuel to the carbs. I cleaned up the spark plugs but that didn't do anything. There is not even a hint of catching. I can't see how anything like the timing would be off since it ran perfect when parked. Any thoughts?