Flathead manifold question

[fireguyfire]

The exhaust manifold part of the intake/manifold combo on my 1942 flathead engine has a large crack in it.

I am fortunate to have 2 newer flathead parts trucks, a 57 and a 58.

I took the 42 manifold combo out to the 57 and it looks the same in appearance, and general dimensions as the ones on the 57.

 

Are the intake/exhaust manifolds from the 57 interchangeable with the ones from my 42?

[Dodgefran]

Measure the similar points on the old one and compare.

[Young Ed]

If they were both the same length block they will interchange. There are a few different dump locations so that needs to match in order to not require changes to the exhaust system