I have a 340 in a 91 Daytona and I am looking to replace the block hugger's with a shorty, 3/8" flange and 1 3/4" primary.

I have searched for a long time and have not found any shorty headers for a 340. Best that I could come up with was SB chevy and move the tubes to fit the Mopar flange.

You might want to talk to Schumacher Creative Services. Just talked with them yesterday. They are mocking up new stepped shorty headers. Should be ready in a couple months. Sound like the hot ticket. They are designing them for small block into A body, so they should fit most anything. 1 5/8" to 2" to 2 1/2" for power, shorty to get around fitment and ground clearance issues.

Check with headman headers, they offer two types small block headers that might work for you.