I have not done it on the 450, but the paper gaskets seemed to fail too often on the jeep. 2 years ago I used the grey sealant for thermostat and water pump from permatex.
In fact a project jeep that I bought for little cash had a RTV gasket for the water pump, no paper, nothing to scrape and it was holding very well with 1 out of 4 bolts holding the high stress points, it was purple blue in color and I was never able to figure out what it was!
The newer vehicles now come with a rubber gasket, no leaks, no sealant to use.

__________________
Michel
74 wagoneer
79 450sl