You really should contact
Ebonite and see if you can get some printed info on Omega layouts. If the info is unavailable you might consider using the A - E line as your centerline with A closest to the fingerholes.
I still have my Omega although I retired it 10 years ago when I went to 15# balls. The A-H thing is called the "driller's clock". There are 10 drilling options. I used drilling #1 which gave me good length with a little bit of flip on the end. For my layout the centerline goes through the center of the driller's clock and point A. The Omega symbol or the CG (center of gravity)on my ball is 1 5/8" from the center of the driller's clock and is located in the A-B quadrant. The pin-CG distance is 5" and is approximately at 1:30 o'clock in relation to the driller's clock when A is at 12 o'clock. Your CG and Pin will probably be different than mine, hence the need to contact
Ebonite for further instruction. On a scale of 1-5(largest) the length for Drilling #1 is 4 and the hook is a 3.
I think that you will find that your ball's acryllium coverstock to be very mild compared to the coverstocks on today's balls. In other words, the ball can be expected to go fairly straight.
There were 2 versions of the Omega Acryllium ball...regular and for dryer conditions. Both were light blue.