I use an oil pump primer and pump the oil out the remote oil filter hose.
Take about 45 seconds to get 10 quarts out.
Since the engine does not rotate, it takes very little time to drop the distributor back in and time it.
I also have a 12v bucket pump and a vacuum tank. The above method is ten times faster.
I used to change the engine oil in the race boat in 20 minutes flat and it held 15 quarts.
GT