`35 intake manifold - differences in aluminum and years

[JM 35 Sedan]

What is wrong with your existing cast iron intake that requires it to be replaced. Could it be repaired? That year truck came with a CI intake, so going to an aluminum passenger car/light commercial intake would not be correct if you plan to show your truck for points judging.
I don't believe that aluminum would have any advantage other than some may think it looks better/nicer.
I did read a test report by George Mitchell (also known here as G.M.) that a cast iron intake transferred less heat to a mechanical fuel pump if/when considering how to prevent vapor lock when just using a mechanical fuel pump with no backup electric to rely on (especially the glass bowl versions) with today's 10% alcohol gas.
I have a cast iron intake on a '35-'36 21 stud LB engine that I may be talked into selling.

[wingerdinger]

I am reluctant to admit what is wrong with my current manifold, but here goes..
I was in the middle of replacing the clutch and pressure plate, and looked under the hood to see if I had adequate clearance from the fan to the radiator, to raise the rear of the motor to remove the transmission...and thought I did.
I proceeded to lift the rear of the motor, and push the fan/generator into the radiator hard enough to crack the mount.
I think it could be repaired, but I'd need to remove it anyway, and they seem inexpensive enough.
I don't really ever plan to show it, but I will stick with iron. Thanks for your advise, John.

Do I really need to learn everything the hard way??