Slant Six Identification Help?!?!?!

it could be a 170, do you have any pictures? how close to the bottom of the vent box on the engine side is the valve cover? there is a big difference between 1" of hose on the water pump & 2" of hose.
you are dealing with a 50+ year old car-- already the rear has been changed-- so do some searching & read up---
slant6.org has good info also, Lawrence