Its been a while since ive thought about this topic so I could be wrong. I thought the 215 plungers had a bowl shape.
(1) can carry more fuel=more fuel to injectors/motor
(2) its a 2* timing retard. Sorry not calling you a retard hahaha, meant 2 degree timing
(3) a 180 pump has more rack travel than a 215 with a 2095 plug. 180 rack travel plus increased fuel with 215 plungers equals a decent pump
Now that i think about it, its a notch..i thought technical name would be a 2* timing notch