Yes there are always pro and cons to any treatment process.
For something like engine parts I personally would lean towards, water polishing or dry ice blasting, as these would leave a minimum of residue.
I am not sure about how the production process or materials of the Flathead crankshaft, something like case hardened journals could be susceptible hydrogen embrittlement.
Sadly I cannot ask my professor in surface treatment and material science any more.
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1941 Chevrolet, Cab 12 CGT, 7A2 body
1944 Ariel W/NG
1944 Scammell Pioneer SV/2S x 2
1955 Austin Champ, 04BF45
1946 Chevrolet 5400 COE, Civilian
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