CB 450... with a motor? what?

I've never seen this bike with its motor in it. Bought it in a box and it stayed there for months. This thing is sooo cool. Yesterday I did the o'l 9:00 to 9:00 shift and got alot done, the xs650 got new carb gaskets so I was able to take the rag out from under the carbs... nice! and its running well. Also put the 450 motor in and tightened up the wiring. Today Im planning on getting it fired up, Pretty excited, couldn't fall asleep last night excited.