U cant. SpitII simply better. It was in RL too (The messer can climb higher, but its dont work in game now). E3 -in this configuration- is spanish civil war era (early '39 - LW get the first planes there), Spit II the BOB most advanced RAF type (Aug. '40). Untill LW cant get E-4, E-7, .../N planes, the SpitII banned in most (historical) servers.
Fly with E-3. Difference with E-3/B only the bomb rack, it makes the plane slower.
edit. Ahh, and one more thing
The E-3, E-3/B manual Prop pitch is much slower, than should be, big disadvantage anyway with this. We hope, it will be fixed in next patch.