How to engine swap on a standard Briggs single 19HP to another Briggs single 20HP

http://www.surpluscenter.com/Engines/...

SPECIFICATIONS

Model 33M6771594G5
Engine Family DBSXS.5402VL
Power 20 HP
Disp. 540 cc
Start Electric
Shaft Orientation Vertical
Shaft 1" dia. x 3.16" tapped 7/1620
Mount 10" bolt circle
Fuel Tank No
Size 161/2" x 18" x 13"
Shpg. 75 lbs.

Original Engine unboxing video with more info
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