What size head pipes and tail pipes used on the factory '68 340?

Head pipes were 2.25” except around the starter where the flange pipe is 2” for clearance purposes.
The left 2” flange pipe was dented severely to clear the starter and torsion bar which was quite restrictive. The tailpipes were 2.25” halfway back and then downsized to 2” and then down sized some more at the end to 1-7/8” I.D. to accept the exhaust extensions. Sorry but the above dimensions were for 1969 340 Darts. The 1968 models were 2” headpipes and 1-7/8” tailpipes.