Please post your exhaust sound bytes in this thread.
List the following info.
Engine size, 318 stock bore {1973 engine} stock compression ? 8.6:1?
Cam size Mopar Performance # 4452759
Duration at 050 inch Lift: 221 int./228 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.430 int./0.450 exh. lift
Header brand and size Stock 273 exh. manifolds
Pipe diameter start at 1 7/8" necked up to 2 1/4"
Cross over - none
Muffler type and size Dynomax Super Turbo 2 1/4"
Tail pipes, size 2 1/4" then thru 340 Dart chrome tips.
# 302 casting heads
LD4B intake 1968 era?
# 1406 Edelbrock carb. stock jetting, used out of the box, except for linkage
http://media.putfile.com/1964-Valiant-dual-exhaust
hope this works, LOL.