Head Oiling

By all rights if you use solid pushrods that should stop the flow of oil but since small blocks are at a 59 degree angle the angle of the pushrod isn't quite straight and may not stop all the oil flow. It's probably not enough to hurt anything but if you can get lifters with no oil through hole that would be best.

If it was a flat tappet cam it would be a easy remedy. Just use AMC tappets. Having not had any experience with roller cams I don't know if roller lifters are available without the oil hole.