1-8-4-3-6-5-7-2 firing order of a GM v-8, pull the no.1 plug and turn the
engine by the harmonic balancer until the no.1 cylinder comes to top-dead
center(TDC). Take the cap off the distributor and see which way the rotor
button is pointing. Set the cap back on and which ever place its
"pointing" to is the no.1 cylinder plug socket. then you go I think if
memory serves me correct, u go in a clock wise motion around the
distributor. The cylinders on the driver side of the Vehicle is 1-3-5-7
and the other side is 2-4-6-8. cylinders 1&2 are close to the radiator end
of the engine. so you find no.1 on the distributor and hook it to the
number one plug. Then you go in a clockwise motion and the hole next to
no.1 on the cap would be the no.8 plug wire and hook it to plug no.8. and
so on

Hope this helps

maxima