We had to unbolt the pan. Kept all the original oil pan gasket including the curved piece in the front. My friend did a thorough job cleaning the old gasket from the block, i.e. scraped with a razor tool, then an air driven sanding tool. He has a bunch of British cars from the 1960's, mostly Minis & is real good at this stuff. I do all his computer repairs. Still have to get all the supercharger stuff back on to the factory accessory bracket. Then the balancer which I just did 6 months ago. Change the oil for temporary oil. Replace coolant & see if it runs & cools, then change oil again. Should be done in another week or less.