'65 Barracuda, what order now ?

Read the instructions for the dougs first. Also google dougs header install for a decent read on an install on a valiant I think some good info there too. Most likely you will set the motor/trans in and leave up about 4 inches to install the dougs. I just did my 65 Dart they went in super smooth. Make sure you put some high heat silicone on the outer 4 header bolts or you'll be leaking antifreeze. I used Ultra copper on header slip joints also.