Putting the motor together is not the hard part, the knowledge of what pieces to use and how to incorporate thing together is the hard part. 95% of the people here could prob put some pistons on some rods then attach them to the crank, but the question is what pistons to use with the heads I am using? What cam is going to work best with everything else that I have. If your concered with actually putting the motor together, go buy one from the junkyard, strip it, clean everything, put new rod and main bearings in it, put it back together, and make it run. If you can do this without major problems you will be fine on that part. The key is be very very clean.