BBC build
For a larger C/I motor in a 9.80 deck the stroke and rod are the problem. 4.375 on the crank and 4.385 on the rod. The bore doesn't matter, but why would you MAX the bore out in a new block. If you have a problem, you will not only be buying parts. But also a new block, or you will be putting sleeves in. As hammer said, the heads will be a problem above a 572 C/I
The problem is in the oil pan with larger C/I motors in a stock front stub. With the larger stroke and rod, you can no longer run a standard rear sump pan. If you are taking that step up to a larger C/I BBC Have the front stub done by a good chassis builder.
The front cross member has to be done, plate it, and change the steering box over to a rack. You may also be changing the front springs. Then the next issue you will have is headers if you go with a T/D So, YES C/I does cost $$$$ in more ways than just building a motor!
Good luck