Off a scrapper will be fine. State of the paint is also irrelevant.
I want to modify my clamps to add a positive lock for "up", as opposed to that wonderful "friction" method used by OMC back in the day. (it is currently held up on a rope off the A- frame!) Thing is my current engine is in not bad nick, so I don't want to be drilling a set of perfectly good clamps to make a prototype....
I guess Davie might be a likely local source?
(and before the flood of "why not get a new one with a lock?" - It clocks in at 13Kg fuelled, and more importantly, fits between the frame & the main....)