hwy guys i revently aquirrd a 750cb rollinh chassis motor in a box looks like its all here im just curious on what year and model it is and possible value what ya think i can get better later vin is CB7501009278
Not $3 dollars. $300 to $400 dollars. Sure CB750's are sought after, when they are in one piece and running. The one you showed in your pictures is not much to look at. It doesn't have much going for it. The right person can get it back to where it should be, but it will take lots of time and money.
Show us a picture of the sticker on the head stock. Do you have paperwork for the bike? That will have the year also. If you don't have documents for it then it may just end up a parts bike.