One more rear end changeout question.

I've got a 67 Barracuda and I've been following threads regarding changing out the 7-1/4 to an 8-1/4 or 8-3/4. The last guy said that will require going to a BBP. I was hoping to keep my SBP. The reason this is important is because I was thinking about changing to front discs, so I need to keep things the same. Have you guys noticed how one thing leads to another?

Were there any factory SBP options for the larger 8+ rear ends?