Only the Thermactor smog tubes for the cylinder heads are the same on the 1967 system. Make sure that the driver side has the extended
tube that partially crosses over the top of the engine, and with the bracket with a little jog for the coil.
1966-67 used a different smog pump and pulley. 1966-67 smog pumps had 4 bolts holding the pulley, 1968-71 smog pumps only take 3 bolts for the pulley.
The hardest part of that 427 smog system to find will be the correct drive pulley. The rest is 1968 S code 390, or 1968-70 428CJ.