* Some big-blocks will fit with minimal modification: Certain big-block Chevrolets, particularly those used in the factory, can be installed relatively easily. This typically involves things like using the correct motor mounts and potentially some minor adjustments to the firewall or inner fenders.
* Others require significant modifications: Larger big-blocks, or those with accessories that protrude significantly, will necessitate more extensive modifications. This could include:
* Modifying or replacing the firewall: To provide clearance for the engine.
* Modifying or replacing the inner fenders: For clearance around the engine and headers.
* Custom motor mounts: To position the engine correctly.
* Custom headers: To route exhaust around steering components and chassis.
* Possibly modifying the subframe: In extreme cases.
In short, it's not a simple yes or no. Research the specific big-block you're considering and its dimensions. Consult with experienced Camaro mechanics or enthusiasts before you start the project. Plenty of resources online detail big-block swaps into 1970 Camaros, highlighting the challenges and solutions involved.
