What if your cam was 360 off?

The car that I am asking this about is actually a 91 cougar, but it has a 5.0HO in it, so engine-wise it is pretty much the same as a 94/95 mustang. I had it all apart and while I was there I installed GT-40 heads, a b-303 cam, 65mm TB, and a 3000 stall converter. Now the car starts and runs every day, so I have been just driving it like it is, but it doesn't get anywhere near the power that it should have from that cam/head combo. I have messed around with the timing by adjusting it then taking it for a ride and seeing if it helped or hurt, and repeating this process. It only makes 7" of vacuum at idle, is a slug off the line, will stall out if I come to a complete stop in gear, and only gets about 13mpg. I already had it apart to make sure the dots on the cam gear and crankshaft gear line up, and they do. So it occurred to me the other day, what if the cam is 360 degrees off? In other words, instead of firing 13726548, it would be firing 65481372, but the cam would be opening the valves not quite at the right time, and the injectors would be firing cyl #1 when the intake is opening on cyl #6, and cyl 3 when 5 is opening and so on. Could this be what is going on and why my motor isn't running the way it should be? Or am I way off base?

Mike

but since each valve only opens once every 720 degrees of crankshaft rotation, then the cam could be opening the wrong valves and the engine would run because it is still getting air, fuel, and spark, but the pistons wouldn't be at quite the right spot, and the fuel injectors would be firing at the wrong times, thus making the fuel not well atomized when it enters the cylinder. When I say 360 out I mean 360 degrees of crankshaft rotation, so I guess that would be 180 degrees of cam rotation. But since I timed the motor by ear and not with a timing light, theoretically I think it would run but not very well. Does this make any sense or am I just grasping at straws? It's ok to tell me if I am.