67 barracuda rear valance

2 other issues worth mentioning... trans cross member in 67 model probably doesn't accommodate duals. Cut away for exhaust pipe is left side only. Then the single fuel tank support strap is left to right orientation so it interferes with exhaust tube routing on right side. Nothing that cant be conquered. 68 model parts are the very best solution but not the only solution. Changing the support in trunk floor to hang a 68 tank and straps is major effort. good luck