Is it possible for 318 to run with dist. 180 deg. off ???

A better explanation, - on most(?) engines 2 pistons are always at TDC at the same time, (except odd, 3 and 5 cyl engines).
On the first revolution #1 cyl fires, - the other TDC piston #6, has just pushed the burnt exhaust outta it's cyl thru the exhaust valve, and about to suck a new fuel charge in thru the intake, this is called "overlap".
When #6 piston gets to TDC to fire, - so is #1, but it's in "overlap" on the second revolution of a 4 stroke engine .
Either cyl is accurate to set timing from .
Some of you probably knew this, but it can be hard to get your head around.
Cheers