Your tape may not be off. Make sure both valves are closed (on the compression stroke, on cylinder one.)when your harmonic balancer is at "0" or TDC. Your crankshaft will rotate twice for every one rotation of the cam and distributor. You may want to start over and install your dist. correctly to begin with. The vacuum advance can. shouldn't hit, if the dist. is in right.
69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1