i dont know about your smog laws over there but i would steer clear of the 305,earlier 307, 350 or even 302 are the prime stock engines,the 327 is becoming rarer,you can mix and match a lot of chev blocks and cranks and come up with a bigger motor than its casting number specifies,or if you just want to drop an engine in and drive it without mucking around,fit what you find,i like the chevy small block.