Thanks Jack. After your comment made me realize I could just check to see how the other N20-engined cars are classed.
228i = 41 Base Points, B
328i = 42 Base Points, B
428i = 40 Base Points, B
Z428i = 49 Base Points, B (52 points w/ ZSP)
Z435i = 47 Base Points, B (49 points w/ ZSP)
Z435is = 47 Base Points, B (49 points w/ ZSP)
It’d be awesome to just have the same number of points as a Z435i. Including the ZSP, I could be in B! Woohoo!