Yes, in fact most people setup the cam 180 because its easier to align the marks that way then the correct way.
The correct way would be to have both the dots on the cam and crank sprocket to be at 12:00. Most people have the cam at 6:00 and the crank at 12:00. It realy doesnt matter once you put the chain on. Just turn the crank a full turn and both marks with be at 12
o turn the crank another full turn and it will be 6:00 and 12:00.
Do not confuse this with installing the dissy 180 off.
How to find tdc.
Pull the valve cover for the bank that has #1 cylinder. Turn the crank so the balancer groove lines up with the timing pointer and so that both vavles are closed. You should be able to spin both push rods easiely.