I went to Case/IH to see what engine was used in the 430, and found out it is the G188D. I then Googled "G188D", and found a site that sells rebuild kits for that engine. Here is a list of what equipment that engine was used in.
Case Combine w/ G188D Engine. Models 600, 660
Case Wheel Tractor w/ G188D Engine. Models 430, 440, 441, 470, 480, 530, 570, 580B, 630
Case Windrower w/ G188D Engine. Models 1150, 1155, 1255
Case Crawler Tractor w/ G188D Engine. Models 310E, 310F, 310G, 350, 450
Case Loader Tractor w/ G188D Engine. Models W3, W5A, 480C, 580C, 1845
There is a serial number break, I believe it said up to '65, where there is a flange difference on the sleeves.
Here is the serial number break...
Early Model - Before Serial No. 2656843 uses a 4.458" Sleeve Flange Diameter (Small Flange)
Late Model - After Ser No. 2656844 uses a 4.537" Sleeve Flange Diameter (Large Flange)
It also shows two different crank shafts... One splined, and one with bushing...
I had a 530 Diesel a few years back. I made a trade I couldn't turn down. Never had any mechanical problems with the engine, so never worked on it, other than normal maintenance. So not sure about the cranks...
I just put in about the serial number break, in case you would maybe think of utilizing parts from one to another, if you find one.
You can always go to the Case/IH parts site, and check other engine numbers.
Good luck..!!