originally LA 318 4bbl Engine??
Yes they are, and the port size is nowhere near the 318 size, quite a bit bigger....
The 2bbl cam was like 248/248, and the 4bbl cam was the 252/258 360 cam?? Something like that, been a while since I looked at stock cam specs......
Other than the heads, and intake, it's the same as the 2bbl.