I'm trying to find an oil filter for my 1964 Dodge Polora 318 wide block. I've been to three different auto parts stores and they all don't seem to understand that there is a big difference between the early 318 wide A block and a LA 318 engine. According to their computers the 318 engine is completely the same. They had me buy an STP s8a filter, it screws in place but needs to be much wider to seal around the side of the block.

The car that I am putting together didn't have an old filter that I could match it up to...

Can anyone help me?