Chevrolet: 97 Blazer 4.3L Vortec Timing, intake manifold gasket, intake manifold

Question
I have replaced the lower intake manifold gasket.  Trying to find 0 degrees on the crank.  there are 2 marks on the crank i am assuming one is BTDC and one is ATDC.  Were is 0.  And does the computer have to go through any kind of relearn procedure? Timing is not adjustable, but I need to get every thing in sync.  I have TDC one number one.  HELP ME...Thanks

Answer
Rusty;
Hi; well if you took out the distributor, you will have to  set up the  motor. but if you never turned the engine over it should be fine, if you took off the drive belt it must go on in the same way you took it off ,  if the engine was turned at all, than yes you will have to re-set (pulleys) it and all pullies.0 is  on tdc.  I think the computer will not have  to be touched but . if you go to the library the tech books there will show you step by step  ok