I'm curious about this as well for my 68 Hemi RR auto. I have a copy of a buddies 68 4 speed Hemi RR and his engine code is 733. (do not have mine...) I can't see the trans code since a rusty seat spring covered that block. So is 734 the code for 68 hemi Auto? And that code is displayed on the pass side valve cover?

Jim