Didn't catch that this was a full case 1/2 VW. Doesn't make much difference regarding the tightness. If you are using a stock distributor with points just grind off the #1 and #3 lobes. #3 is retarded on most VW distributors. This means that the #4 distributor lobe now fires at TDC (or however many degrees advance you use) #4. This is 90 crank degrees later than the original #1 TDC. Mark this new TDC using the normal procedures to find TDC and go from there. If you have already ground off #2 and #4 lobes and use the original #1 lobe for #4 cylinder, the engine will run but the #2 cylinder will have slightly retarded timing. If you started with an '050' distributor you can use any pair of opposite lobes you choose. There is no retard on this distributor. TDC #1 is marked on the distributor with a little stamped spot on the rim under the cap. When the rotor is pointing at that stamp the lobe under the points is #1.