Z22s are really hard to find and the blocks on Z24s are taller than l20bs im pretty sure so i doubt they would fit in a 1200 all that well
L series all the way
my car moves along fairly well and its just got a stock l20b with twin 40s(untuned), oh and its only firing on 3 cylinders and still handles well enough to keep up with A series vehicles of similar suspention setup