Walnut shells might be ok but soda blasting would be the safest way to go due to the ability to wash the soda away. I wouldn't be able to sleep well knowing there had been beads in or around the engine.
Also have to say I don't have much experience with the 356. Hopefully someone that has done it will chime in.
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Michael
88 911 Diamond Blue CE Carrera 3.4 HC3.4 member
2020 Honda Passport
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