Technical Bolt length SBC w/ramshorns

I don't have access to the engine right now or I would just measure, am wanting to pick some up on the way to the shop.
What length do the center 4 bolts on SBC with ramshorns manifolds need to be (the 4 long ones in the middle of the manifold).
Thanks for the help-

 

Don't have easy access to any manifolds right now, but 2-1/4" is bouncing around in my head. For what it's worth.

 

2- 3/4

 

I knew it was 2 and something- 1/4.