I have a 67 belvedere with a 383 and the HP exhaust manifolds. How the frick do I manage to get a compression tester into the spark plug holes. Do you have a recommendation on testers that allow for almost 0 clearance and can be done blind since the manifold is in the way. My testers all have about 8 inches of hose connected. Basically I need a fitting that threads in to the spark if holes and then I can connect a qd to.