oiling mods for dummies

I have read thru the small block oiling mods so many times ive made my brain dizzy-ok i have a 72 360 L.A. Block with bushed lifter bores and have problems with not enough oil getting to the rods and mains, we oil the rockers and springs with spray bars so the main oil to the heads is blocked, what mods do i need to do to get better oiling to the rods and mains???? Do i need the crossover or not? ?? Thanks Steve