can change to porsche engine because they have basically the same design.
if cannot find porsche engine, then have to try n use other engines lo. dun care la FD, FC, 4G63, 4AGE what ever, if ur mechanic say can fit, then can lo.
if we forummers say can fit but ur mechanic say cannot fit, still cannot be done right? because ur mechanic is the one who is going to do the job.
so best thing to do is consult ur mechanic.... we forummers know how to talk cock only hehehe