Good afternoon. The oil cooler on my 78 201 hasn't been rebuilt in at least 25 years. Has anyone had their old oil cooler rebuilt and noticed improved CHTs, oil Temps, and maybe oil pressure. I also have a small gap in the pic below. Should there be a gasket or something to fill that space? My mechanic didn't think I should rebuild it but I wanted to see what you guys thought. Thank you for your responses in advance.