If you aneal the gasket you are softening the copper so that it will crush and seal. If done properly you can fit the gasket with no sealent and not have to re-torque. If the gasket isn’t softened there is a high chance that it won’t seal.

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)