early heads on roller LA?

My 360 came from a 90 dodge pickup, so from the factory it was a roller cam engine with swirl port heads. When I went through it the first time I put a regular hydralic cam, lifters, and a set of 79 360 heads on it. I want to put a roller cam back in it. can I still run these heads....I noticed that the pushrod holes on older heads are smaller than the swirlport heads it used to have on it. How about engine Oiling? am I going to have to go back to oiling through the pushrods with the roller cam? What am I going to have to do to make it work? I dont want to ditch these heads....I have alot of money stuck into them for bigger valves, porting, bronze valve guides...ect....

also can I want to run an agressive roller cam...can I get a set of stock roller lifters? will they be okay?