Honda-SOHC

Hi, I am in process of starting rebuild on a 1978 400/4..its in poor order cosmetically, but otherwise ran fine till about 5 years ago, hasn't turned a wheel since..  I expect all the usual probs.  However, where do I start...  Do I pull apart, or try and get it running and assess whats required.  I rebuilt a CG125 around 25 years ago and have a mech/eng back ground so pretty handy with the tools..

Any advice would be great.

Thanks  Stuart