351 Water Neck

Need to change out my stock water outlet neck on my 351M.
It has a crack and is leaking but, I can't seem to find anything that fits. Can I use a neck from a 351C or 351W? What about a 400M? Need some help. thanks in advance.

Also need a 180degree thermostat that I have not had any good luck finding one. any help is great. thanks.

400, 351M, 351C, and 429/460 should all fit. It just depends on how you want the angle of the hose to come off it. There are several variations. You must use a thermostat for 351C/351M/400 as they all come with the bypass disk on the bottom.

Yep they all fit but just watch your dissy clearance , and good luck getting your part numbers for your radiator hoses. good tip take your old hoses to your parts supplier and match them that way.