Depends on how long you intended to run the engine at any RPM.
Proper way to address the situation is to run race clearance on the rods and mains. Prefurably you spec'd a crank with a Chevy rod journal, iether 2.100 or 2.200 (small or big block chevy rod journal). Journal width doesn't matter so much, you can get either ford or chevy as quality rods are available in either diameter in either width.
Prefurably the assembly has at least .001" x diamater of bearing. Big block mains, like to actually see about .0035" with a .0025" rod bearing clearance, with side clearance on the rods at about .0015" to .002"
With those sorts of bearing clearances, and running a 3/4 oil grove main bearing. The oiling issues of the crank/rod of the 351W and or the 460 are no problem at all.
Now as to reguards to the oil drain back, several precautions should be addressed there. First and foremost, have the drain back holes opened up, and flatten or "puddle" the area around the drain back holes to eliminate a slight rise and sharp edge that typically holds oil in the lifter galley. Simialar treatment should be done to the drainback holes in the heads, and ensure the head drainback is uninterupted through the deck and headgasket.
Most importantly is actually reducing the volume of flow from the mains up through the pushrods into the valve cover and lifter valley. Aftermarket blocks come already tapped for inline restrictor plugs. Stock blocks require some drilling and tapping.
If you look in the two upper galley (lifter galley) locations you can see how its stepped. THere is a tapping and thread for an inner plug, and then the larger outer plug. The inner plugs are installed drilled for an oil flow restriction, the lower passage on the left is the main bearing oil feed.