oil passage ???

I pulled the valve covers off the 340 today to see why the lifters are so noisey, i found the shafts were put in wrong , thats no problem to fix, my question is in the oil to the shafts, I assume oil is fed via the rocker stands. is this correct? , also is a banjo bolt used ? if so what is the proper location? i seen to have no oil to the two rear cylinders on the drivers side, and that is where most of the noise is comming from. thanks again for your help