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@paragonbuilder stated the old cylinder should clean up. Clean up the cylinder and throw a meteor piston in it if your cylinder is still good. If your cylinder is trashed, the oem 395 cylinder kit is 139$ on ebay last time I checked. I converted a 394 chassis to 395 just recently, 395 throttle cable, entire intake tract and 395 carb are needed. You can use the 394 carb base but it needs the throttle cable hole drilled out larger in the base. I’d try cleaning up cylinder first or finding a good used 394 cylinder.