Thanks for the kind words.
After having driven the 12v a while I kind of got used to the power. On top of that it didn't really run that well on LPG, low MPG and high CO, so I decided to fit something else.
First removing the exhaust and prop again and then disconnected all hoses and wiring. After that a friend came to give me a hand and we took the brakes off.
Then it was time to remove the engine (again).

The 12v with the box and clutch removed.
Time to get the new engine ready.
24v BOA on the engine hoist
Putting it on the engine subframe.
Then fitted the 12v flywheel and a new clutch kit to the engine.
And the box back on.
And lowered the car over the engine and box to position them correctly.
Then it was time to mount the subframe, gearbox mount, arb and struts.
Still had some time to fit the radiator with the electric fans and some coolant hosed. But at 21.30 I called it a day, kind of exhausting when working from 9 am.