Thanks for that pic,looks a good fit.Familiar w/Appliance.Remember,I have side exhaust,may give in and exit inner fenders to join side pipes.(potential conflict with laws regarding external pipes)So ---have options to consider.Basic concern c/o verses t/b was space limitations,removed p/s to install 340 stock manifolds,want more power thus headers etc.66 chassis limitations concerning width or lack thereof.Have not had flex prob that am aware,but have very stiff B body bellhousing and clutch setup,my 340 is very stout,mild mods,was out of 70 Dart only 5k miles,hit cement barn,LOL,has dbl vale springs,big valve heads,have only 600cfm Holly and needs bigger fuel lines,runs out of fuel around 10k rpms.Hence my interest in beefing up chassis etc.MUST HAVE MORE! Thanks again,S