Before you start buying scarce and expensive parts, wouldn't it be wiser to evaluate the condition of the rest of the engine? All it takes is a little labor to do things like drop the oil pan and look at the condition of the crankshaft, connecting rod bearings, and other major parts. Just reassembling the valve train with the parts you have and doing a wet and dry compression test would give you an idea whether or not the engine is going to need any major repairs. A cylinder leakdown test with compressed air will be even more informative than a compression check. None of that sweat equity is as glamorous as getting it to run, but a jug of hand cleaner is a lot less expensive than a laundry list of parts that just might get installed on what eventually turns out to be a boat anchor. You don't even need the oil connector to do a compression test.
Jerry
