I have a 62 292 that will be going in my 55 and noticed it has a smaller temp sending unit then the 55,I doubt I will use the 62 heads but for my gauge to work right I need to use the original sending unit so can the head be drilled out or will I have to use 55 or 56 heads since I think the smaller sending unit started in 57.

Butchering up everything I can get my hands on in Dayton Ohio