Oil pan

The best oil pump for a slant is an original mopar stock pump pull the cover and clean it and check the clearances on it and clean and reinstall the relief valve inspect the drive gear if no problems then reseal it packed with Vaseline or engine assembly lube use new gaskets and your good to go. The original gears for the pump drive are better than the new manufacture ones. The oil pumps in most cars and trucks are the most over replaced items. Most are not worn out and still within spec's