The block already has oiling provisions for the lifters. so I just used retrofit hydraulic roller lifters, and oil through pushrods. I had the machine shop clock the cam bearings to block off the oil passage to the heads. you have to make sure you still have a hole lined up for oil to the bottom end on your cam bearings, if the bottom hole doesn't line up, like mine didn't, then you have to drill a hole in the bearing.
I also recommend drilling, tapping, and plugging the oil hole on the firing deck to the heads. I didn't do it but I will in the future for extra security.
As for rocker longevity, I am running Comp Gold full rollers. they have an oil hole on the back and the oil comes right up through the push rod. I tested my oiling by spinning the motor over with the valve covers off until I built oil pressure and could see that my oiling system was working fine.
As for the bottom end, I am currently running a 318 magnum crank for the time being. but I have a steel 340 crank that I will probably use. if you get a 340 with caps, the rear cap wont work for a magnum oil pan. I had to use the magnum rear main cap in order to use the magnum oil pan gasket. they mic out the same ID, but the 340 rear cap is bigger on the outside because of the different oil pans. Also, using the magnum rear cap allows the use of a magnum rear main seal.
the magnum heads went right on. im using stock length hardened pushrods from edelbrock. I think its part number EDL-9644 from summit. I THINK. I know that they 5/16, are 9.638 long and .080 wall hardened push rods. I bought some rocker studs from Hughes for the heads, and then went with stud mounted rockers. adjusted everything out and it runs great.
if you have anymore questions let me know. i'll post pictures and info about the whole build up