Engine Swap confusion

I need to put a new engine in my 95 ford probe se and i want something faster than the 2.5 whats the fastest engine that will fit and a quote

the Mazda swap, about 4k i think? importing purchase and all, im not a probe guy :)

you best bet is to get the mazda version of your motor and boost it. It would be easier to buy a GT and drop in the KLZE, than to swap out the 4-banger to the 6.