I have a sandcast bike, frame #1080, engine #1246.  It ran perfectly when I parked it 40 years ago. I’ve pulled it out of the back corner of the garage, uncovered it and dusted it off.  The tentative plan is to get it running, take it out for a few rides, then pass it on.  (Tentative plan, meaning I may get hooked again then all bets are off.)  Some work will need to be done before attempting to start the engine.

The question is how far into the engine I should go.    At a minimum, clean out carbs.  Replace points, plugs, oil filter, and air filter.   Going further would involve pulling the head and grinding valves, pulling the cylinders to replace rings.  Further still would be to split the case and examine all those components. 

Would a potential buyer, prefer a bike with an engine that has been completely overhauled, polished, restored, or a essentially untouched engine with which they could do their own restoration work?  If I go to the extra expense of doing an overhaul versus minor repairs, can that expense be recovered in the sale price? 

I got some very good thoughts from one member of the group.  Interested as well with others’ ideas and thoughts as to various approaches.

Thank you for your kind comments.
There are a few problems, some of which the pictures reveal. 
The pipes have seen better days.  Apparently condensation tends to collect at the low spot between pipe and muffler and the rust starts there; hasn't quite broken through yet. There are several pinhole leaks along one of the seams.  At one time years ago  I contemplated replacing all of it with a 4 into 1 Kerker.

The black sissy bar I fabricated years ago because the girls  were afraid they would fall off the back.   Sometime before 1972 the seat lost the strap; one screw holding it is missing. Presumably the original owner removed the strap rather than replacing the lost screw.

Not sure about the mirrors; I get different bikes mixed up.  I may have replaced them because they were vibrating too much and thus not serving the intended function.  I may have swapped them from a CT90. 

The paint on the tank is good.  No dents, no scratches, not much fading. The side covers have faded considerably, particularly along the top.  Same with the headlight.  The right cover is now broken and I doubt it could even be pieced together.

The tank does have a big problem with corrosion and deposits inside.  I did not drain the gas and over the years it has evaporated and left a mess inside.  I hope I can clean it up without messing up the paint.

Greetings all.  I've owned my 750 since about 1972, bought used.  I've had much enjoyment riding all over Southern California.  But life intervenes and it's been parked in my garage since about 1982.  Now the time has come (finally) to do something with it.  I discover now that what I have is an early sandcast engine. 
Frame CB750E-1001080
Engine CB750E-1001246

This creates a bit of a dilemma.  I don't want to do anything involving short term quickie fixes that might jeopardize a future restoration.  I'm also a little leery about turning it over to some bike guy to get it going for me.  I don't have the time really to do a full blown restoration, but I would like to get it running again and cruise a few canyons. 

So I'll need to do some research about how to proceed, where to find rubber parts, how to clean the gas tank, and the like.