When you lined up the marks on your timing chain gears did you have the cam marks on the low side and the crank marks on top so they lined up? And if this is when you dropped your distributor in for TDC cylinder #1 . Then you are 180 out. you were TDC for cylinder 6. That is TDC for Chevy but not for Mopar. Unless of course you rotated the wires too.
