German 1977 MK1 with 1.6 Kent Crossflow for Upcoming Sale

This is probably last of its kind! I could use some advice on this. Please HELP! Has about 90% intact everything including body, interior, sunroof, engine, bell housing, exhaust manifold, both resonators and chassis, wheels, tires, glass. How do I move forward? Will start if I clear out carb. Bogs on hills. What should I do or NOT DO in moving forward to sell/auction?

Can you show pics of what you're up against?

Mostly engine bay to help us find your issues - if it bogs on hills, being a manual of automatic - can be a sign of other issues not yet discovered...