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

Have a on going engine idling/ running problem, have a 69 Cuda 318 . auto , have a Holley carb on engine, I have about 200 miles on engine. thought had a carb problem. I have another post on here about that, from what I got out of the group on here, possible timing issue, so any way, I had some time to start checking., Car will idle in park put in gear dies, checked for vacuum leaks found none, I have to keep the idle at about 900rpm so it will not die in gear, but still rough ,reset carb air fuel with vacuum gauge for best vacuum about 15 in., [ have a mild cam ], hooked up my timing light which is a Innova 3568a which you can read more then stock timing. had hooked to number 1 spark plug wire, have timing marks paint with white to see them easy, and the bal, timing mark is painted white, set idle, tried to take a reading with the timing light could not find timing marks anywhere, while using the timing light, some how adjustment buttons on the timing light I had it set at 90 deg. and did not know it, I put the timing light on the timing marks and I could seem them, so now I am thinking do I have the dist, 180 deg, off ?? to add to this I shut off the engine and would you know it the timing mark was right 0 deg. with the mark on the damper, at 0, so I pulled off the dist. cap, I marked the cap where number 1 is with the cap off the rotor was not on number 1 but 180 off !!, now I ran out of time, now I do not know if it was on comp, or exhaust when I shut off the engine and it so happen to stop exactly on top dead center! I will need to get number 1 to tdc on comp. and recheck the rotor to see if it correct,
Now my question is would the engine run like this if 180 deg off ???