BLCC is the code for a 1953 216 (out of a 3/4 ton or 1 ton truck 3600/3800) ton truck)
Look on page 3.1953 is a "complicated" year - a transition year for 235s.
Your engine is a 216 - the clutch size is shown at the link above: 10 3/4" clutch disc (RPO).
As is always the case with these old trucks: the flywheel/clutch-assembly might have been changed over the years.
