1945 jd A manifold

I've got the head off for a valve job and head gasket and might not be able to remove the manifold without destroying it...it's currently soaking. The tractor has a PB, G carb, and I'm probably going to add murphy's rockers when I put it back.
What manifold should I look for? Are there manifolds from another year that fit and would work better? Johnson if I can find one...I feel like this tractor is too stock to see any benefit from the murphy's piece.
Thanks
 
For the money I would just get one off late gas "A" A 3386 R. You can get a good one off e-bay for $45-$75. Make sure it has the part # on it or it might just be an aftermarket which I question metallurgical integrity of and land of origin. Some even hog out the little exhaust runner inside for more flo but in my opinion it's a waste of time and I believe JD designed it that way for a reason. They could have made it a lot cheaper if it wasn't of some scavenging benefit.
 

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