issues replacing timing chain set

the other day on my way to work in my 74 duster i destroyed my timing gear in my 225 /6. i got her all torn down and cleaning everything up
i have my crank set-- tdc#1
cam set --marks lined up
new chain and gear set pre lubed
my questions/issue; my crank timing gear wont go all the way on the crankit has about an 1/8" to go.... i didn't think it would be a good idea to hammer on it so i thought i would ask first...

also can anyone post the torque specs for cam gear or link the removal/ installation

with the marks lined up on the timing gears. when i set the distributor back in do i set it at #6?

thank you so much in advance everyone
don`t know about the /6 timing, but every chevy I`ve ever built had to have the lower gear driven on. made a driver out of a piece of 1 1/2" alum pipe. worked for me ----------bob