Denny,take a look at the photo links.The pictures are of an oil bath breather off of a 1951 chevy car,216 engine.It looks identical to yours.
The very top is 9 1/8" diameter.
The lower part is about 11 1/8" in diameter
Total height together is 6 1/4"
Carb hole is 2 5/16" diameter
1951 chevy car oil bath breather pic#1 1951 chevy car oil bath breather pic#2 1951 chevy car oil bath breather pic#3 Hope this helps in any way !!!
