Ok, im going to try and describe how i think this is possible, the motor has a 180 degree firing. so both pistons travel up and down at the same time, one side gets the fire the other rids of the exhaust at the same time. The head is the same on the outside as far as the side that have the tach gear on one side and the other has the points. The tach or the points assy can be mounted on either side of the head, same bolt holes etc. the cam is center driven. so the timing chain will be straight up either direction. the head, cylinder, and valve cover have 8 long ass bolts that travel all the way through them all, all are spaced the same front back and side to side. So take the head rotate it 180 degrees so the exhaust comes out of the back, carbs in front (ram air anyone?) here is the tricky part or possibly the easy part. The cam has 2 lobes, both exactly in the same spot, so i could rotate the cam 180 and bam. the cam would have to be advanced 180 being it will be rotating back wards. as far as the specifics on the cam, im not 100% sure if the lobes are exactly the same shape travelling forward or backward, ill check tomorrow. Here is the easy part as long as it moves correctly, and triggers the coil to fire, if is firing on the wrong cylinder swap the spark plug wires making cyl #1 now #2 and vice versa. hopefully this makes sense.
