Sounds like you are close to the limit, what kind of car (engine are you dealing with?
A couple of things to look for:
1. Do the legs and boom of the lift/hoist extend? Best to slide them all of the way out to their marked limit.
2. Most likely the engine hoist would start to tilt forward, e.i. the rear legs of the lift would start to come up off of the ground. A couple of helpers would be called for, plus don't stand under the engine and/or crane (obvious of course, I know you're smarter than that, but my lawyer made me put that in)
3. Wait a couple of days and maybe someone can give the weight once they know the year/model car...