Modern GM V-8s are the Chebby design, and they only make one size of those anymore - small. So, when a "crate" motor is listed as a "400 CID small block," it's a modern day small block chebby ... and not much else.
Pontiac's last V-8 was built in 1979.
Q
PS: Like Brett says - "...the only dumb questions are the ones you don't ask."