Timing Chain-moving the Crank

70 Valiant, 318
Replacing timing chain. Old chain/gears were aligned with dots at 12 and 6 prior to removal.
New Mopar P5249267 double roller set purchased.
When I try to install, the crank gear is off by a few degrees.
The old chain was loose and had 10* of play, so I think some teeth may have jumped.
So, can I move the crank back an inch or so to align the new gears?
Thanks
Danny