That 366 is a BBC and its larger cousin in the 7.2 427 BBC. These are tall deck engines IIRC, asthey have the extra oil comntrol riing. They were dropped in 1998 for the L21 454 which is a Vortec 454 with a 24x relcutor crank signal/CNP ignition and ETC using the Vette ECM. Pretty much an overgrown LS1.
Prelude to the GEN 7 8.1 BBC.

peace
Hog