-those horizontal rubber hoses in front of the block were common to all the Pontiac engines in the 1950s and early 60s.
'59 was the last year of the "horizontal rubber hoses". They were part of the "reverse flow" cooling where the cooler flow from the water pump went to the heads first and then down into the block. In 1960 Pontiac changed over to the more conventional flow into the block first, then into the heads.
Carter AFB carbs were available on Pontiac V8 engines as early as 1957, so yours may be original (or original type) to the engine.
This page (from a Pontiac Master Parts Catalog) MAY help you identify a '59 engine. I say MAY, because the early '59 engines were identified by a decal on the passenger's side valve cover (probably long gone on yours), but late '59 engines had a letter code stamped on the front of the block passenger side just below where the head joined the block.
