M535I

i have bought a uk wagon my98 and its ebgine is blown , dont know what damage has been done but it blew at 140 and pi##ed oil out the right hand side of the block i presume its got a hole somwhere, im looking for advise as to what engine to replace it with i would like a sti one for strenght and the potential of more power any suggestions as to what i can put in there ?