Have the seller measure the intake port for you
If its 1 1/2 you should be good
If its 1 3/8 it's most likely 216 or early 235
You could still use it but you will need the exhaust with it and the carb spacing will be smaller, so you will need the carb for that manifold.
Also check how the exhaust flange runs, some will run straight down, make sure it matches what you currently have.
Others will be along to correct any errors I made
Good luck
