Oh no, not at all, and not trying to be an ass either...I just prefer to have the less weight on the hoist and and engine stand....now putting the motor back in, I'd much rather have it as complete as possible...
Hell, when I did my headers, I had the motor out to fix a broken flex-plate..I just slapped the headers on with the engine out, and coaxed it in...
No idea how, but I managed to get that **** in there....
I'd say, Go with what you're comfortable with.