jbinwa,
I don't know if this will help. The timing marks you describe are usually found on the crank pulley of more modern rigs.
I think your engine still has the window above the starter with pointer and mark. On a 261, the mark might be a triangle...or it might be the traditional BB inserted into the flywheel.
Using a timing light, factory timing is with the pointer, and which ever mark you have, lined up perfectly. This of course is done with the vacuum line pulled and plugged at the carburetor.
Again, I think that this alignment will give you about 5° initial advance. For most purposes, this alignment is referred to as TDC (#1).
The marks on the flywheel become dirty and are hard to see...the pointer in also hard to see.
Clean both these items and give them a dot of a bright paint.
If you are pulling the engine over by hand searching for the marks in the window, keep in mind they will appear twice in two rotations of the crank..once when the piston is TDC on the power stroke (correct) and once when the piston is TDC on the exhaust stroke (not correct). You must determine the proper one.
Remember your firing order..153624, and the clockwise rotation of the distributor.
I hope this has helped...I hope it is correct!!
Stuart
