Yes, you can use solid rollers on a block that is not drilled for hydraulic lifters. But don't waste your money on the pin oiling feature in that case, because that oil comes from the lifter galley. If there's no lifter galley, there is no pin oiling.
This also means, in my opinion anyway, that you should avoid extended periods idling the engine, because without the pin oiling feature you are relying on oil splash to lubricate the needle bearings in the lifters. You need to rev it up periodically, to make sure the lifters get some oil.
