ive ported one it helps not much but its better than nothing,
cut bottom as thin as you can and smoothout as much as posible,
raised top not worth alot on stock blower stock ic setup remember air moves more efficiently under boost.
cheap things to do port blower port heads port exh manifolds these will be noticable do each as you can if doing headgaskets the porting of heads is a good thing to do while its apart, same with exh manifolds ,