Timing Mark on Cam Gear 180* off

First thing... keep in mind that i know nothing about slant sixes. I assume you are saying that when your crank gear dot is at 12:00 at TDC on the #1 cyl that your cam gear dot is also at 12:00. Keep in mind that on a four stroke engine that the crank takes two revolutions to go through the four cycles. The cam turns at half the speed of the crank and only makes one revolution. The piston wil be at TDC twice. If you turn the crank 360 degrees , it will be back at 12 and your cam will be at 6. On v8 Mopars, when crank gear and cam gear are both at 12, # 1 fires.This is the power stroke. When crank gear is at 12 and cam gear is at 6, # 1 is on the intake stroke. # 6 actually fires at this time.