[heneste]

Nice car! It will be easier to sell if the engine is in running condition and you'll probably get a better purchase price too. As long as the engine doesn't need major overhauling/expense and it just needs to be refreshed, I would opt for the time to get it going. As Charlie mentions above, some buyers will be leery or scared from purchasing if they feel something's wrong with the engine. If you're worried about missing something to get it going, check with the local clubs to see if anyone would be willing to help out.