if your already using a sr20ve distributor someone has done some rewiring (assuming not you or you would have known this) so IF you do want to change distributors a ve one would be a direct swap. Now if your using a DE distributor (guessing you didnt do the build or you would already know what your using) then you will want to replace it with the same type to avoid any wiring. all you do is cut the bottom ear off, if your already using a de dist just copy what was done to it to the new one.
with that said, i'd change the maf before going any further.
with that said, i'd change the maf before going any further.