If you are swapping in a 350, you can drill and tap the intake manifold at the left rear for your bulb (no extension necessary). This area of the intake is a dead end and has coolant there.
Thanks belongs to Hotrod Lincoln. He told me about that fix. Worked like a champ.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission