Yes
If you are asking if a small block chevy V8 flywheel (most common engine in a 1967 Camaro) will work on a Pontiac V8 (most common engine in a lemans), the answer is no.
With gasoline
Yes.
Yes.
No.
Yes the block should work fine but make sure the water passages in the heads line up. That is as long as your camaro came with a v8 otherwise it will need a bit more.
It would never hold together.....
If they are indeed both small block Chevies, then yes the intake will work.
No, the Chevy 454 has a long stoke and requires a big block. However, it is possible to build a 454 small block using aftermarket parts. You'll need some high flowing heads to make it work.
Yes
Though I haven't done this myself, I think you'll need to change the frame mount. The Camaro was available with a big block so the mounts do exist. In particular the Camaro Yenko with the 427. install camaro frame mounts and it will work
Will it fit? Yes. The physical dimensions and mountings are the same on all small block Chevy's (pre LS-X). The problem will be with the ECM's programming. The 305 's programming won't work with a 350.