Question about BB 4speed crossmember

[Ohio427]

Greg, great site you have there. The pictures tell me what I wanted to know. The picture of the SB crossmember is exactly like mine. It shows the bolt holes to the right of the opening. I just don't understand how mine bolted up with BB engine mounts and SB Xmember. Do you guys think that I should replace the SB with a BB xmember. I worry now that with this combination that I am putting undue stress on some part of the drivetrain whether it be the rear end, transmision or engine itself. It just seems like something has to be taking the force of the 1/2". I have put over 500 miles on this setup and haven't noticed anything unusual like an engine or drivetrain noise or vibration.