Robertshaw # 330 is for the 49-53 Fords and others, I have been running the same pair of original Robertshaw t-stats for many years.
I don't know if there is a number for the earlier V/8's
link below could be a repop of the originals? (19.99 ea.)
http://www.flowkoolerwaterpumps.com/...c22/index.html