Steve,
What I noticed was the shape of the cav plate. The KE7 prop shaft was smooth as well adding much selection to prop sizes. The clutch pack is a real pain to me.
Steve, main reason is I brought it up was using a KFG7 driveshaft in a KE7 tower allows the use of a 22 inch motor on the KE7 tower. The short tower & long shaft allows full engagement of the rat rod motor. Using the KE7 gears & prop shaft allows a race prop with more pitch to be used with the smooth shaft prop shaft. Also in Scott’s case a KE7 tower is better as he runs .5" shallower & again have a better selection of props with the smooth shaft. Only down side is the forward prop shaft bearing is smaller which may fail easier. The KE7 flywheel must be in place to set the points which makes the use of a degree wheel impossable. I prefer the KF, KG, KH type flywheel as timing is much easier to adjust.
Also the 19 was very close to the A.J. 28, check sizing & jet sizes but the AJ19 was a pain to keep in tune. Many went to the 29 for this reason.
Then a guy can swap reed blocks & have 8 reeds with a KE7 motor too. All kinds of fun to be had building a green tanker huh! 😀 Easier to build a sleeper 
Jeff
