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

Have a set of original 383 pipes that for some reason I have not trashed. The tail pipes are 2 piece the main pipes look like they where lifted by a forklift from underneath. Tom and I discussed this when I bought a new set from him and thought his offering was not the same. He explained some changes and I am pleased with his offering and just had a little issue with the left side taile pipe. We had also discussed the fact I was a little modified under the hood and he addressed that. They are not spot on the same but fit correctly and I am pleased.

My only complaint would be the head pipe hardware was substandard. One of the nuts is very deformed.