The weight is nothing like even the minimum of your suggestions of 350KG and is around half that.
2 strong people can lift a complete engine with head (I'd guess it is circa 160 KG).
If you are buying an engine stand I'd actually ask what you intend on doing with the engine whilst it's on there. For storage a "dolly" is probably more appropriate as it saves so much room. If you are pulling and engine apart or building one up then I'd go for a higher rated one as they are not that stable when pushing them around on concrete garage floor. I've got
https://www.machinemart.co.uk/p/clarke- ... ine-stand/ and it is totally safe & stable. I'm not sure I'd say the same about their lightweight one : -
https://www.machinemart.co.uk/p/clarke- ... ine-stand/