Mark your balancer at 0 degrees tdc and where ever you want to set the timing ultimately - 10, 12, 14, etc. (clean it with a rag and brake cleaner, and then white out works great). Rotate the engine by turning the balancer bolt with a ratchet wrench until the pointer is pointing at 0 degrees tdc and the engine's on the compression stroke. Pulling the #1 plug and and feeling for the piston pushing air out is probably the easiest - you can also pull the valve cover and watch for both valves closed when at tdc. There are 2 tdc's for each distributor rotation - you must get the right one. Once you're at tdc on the compression stroke, back the timing up to wherever you ultimately want it set - say 12 btdc. Now, unbolt the distributor and pull it up enough that you can rotate it. You want to restab the distributor with the module about half way between the t'stat housing and the a/c bracket on the other side while simultaneously having the rotor pointing as closely as you can to the #1 plug wire. When the rotor is pointing directly at #1, it will fire the number one plug - and you want that to happen when the timing pointer is pointing at 12 btdc. That should position the distributor pretty close to the timing you want, and put the module in the middle of it's travel. Once you've done that, crank up the car, let it warm up a a bit, pull the spout out and with a timing light, set the timing where you want it. You should have plenty of travel on both sides of the module to set the timing. If the distributor won't engage with the oil pump shaft, just take the proper socket/extension, insert it into the dizzy hole, and slightly rotate the oil pump shaft so it lines up with the dizzy the way you want it to. Be sure to duct tape the socket to the extension. Don't want to take a chance losing the socket down inside the engine.