65 Barracuda 318 Rebuild, Cam, timing, lifters maybe a kit?

I disagreed on a double roller for the fact that you can put a new steel silent chain setup on that and run a MP tensioner and never have to worry about it again. Even DR's wear over time, just look at your new one in 6 months.
Unfortunately, this does not solve anything of interest, unless you worry some timing variation at light cruise, or chain noise. The chain still stretches the same as with or without the tensioner in place (and very probably more with the silent chain) and the cam's timing still retards the exact same amount as without the tensioner, with the subsequent degradation of throttle response, low RPM torque, etc.