I have done oil cooler reseals on an engine in the car. You have to take everything off the top of the engine: carb; intake manifold; generator/alternator come off with the fan, remove the decklid first make life much easier. It can be done in day with great results, (if that is the problem), and you get a great view of the top of the engine while your there. Please review all the info in the preceding posts, they are all right on... Another way to get a good look is to steam clean, then back the bug up on ramps, (you know the kind you buy at parts stores). Keep us posted, Patrick.
'72 Super. Paint-7/20/09, 400+k miles, New engine case "41" Brazil, rebuilt German heads, new Bosch electrics, new Solex German carb. new German silencer. Built by Steve Tims Performance/Enterprises, Riverside CA. '73 OEM airfilter, (Fram elemement), chrome stock wheels, daily driver, 25.46-27.50mpg, driven 20+years.