I have gone through my 216 straight six - new gaskets, etc. The truck was running when i took it apart... I have replaced my carb with a NOS Carter YF climatic control choke. In setting my timing, i went through these steps - let #1 cylinder intake valve (second from front) fully open then fully close by turning engine by hand. after #1 intake closes, i advanced the engine around another 1/3 turn (approx) until the flywheel mark U/C is at the pointer on the bellhousing. I then adjusted my points to be just open (and about to fully open). My wires/plugs/coil are all new. distributor cap, rotor, and points all look fine. I have firing order set at 1,5,3,6,2,4. The thing will NOT crank. any ideas on what else i should try? did i not use the correct timing procedure? any ideas appreciated.