I think you're headed for more headache than anything you gain might be worth.
On the front end, the link below is to BobM's wiring diagrams, which includes both original 6v wiring and 12v conversions. If you doa quick search on this board on conversions you'll find some pretty detialed instructions on things that need to be done, recommendations for types of alternators and the like.
As far as the fan goes, I'm not sure what you'd be gaining, if you could even find an electric fan to fit up. Those old thermosiphons (no pump, no thermostat) wre wicked efficient, made to run and run hot all day without overheating. The original fan was key to that, along with the radiator. I well recall hearing those tractors working from a distance and apart from when the governor would grab hold and make her bark, you never heard the exhaust on them. What you did hear, steadily, was that fan howling. It's made to move a lot of air across an oversized radiator for the motor. That's one factor in why they're so hard to heat up in the first place. I know I've taken one of mine after a few hours mowing and the top of the radiator would be so hot you couldn't rest your hand on it, while the bottom was quite cool and comfortable.
If you're having problems with overheating just running a belly mower, I'd suspect you'd do more to solve the problem by flushing out the radiator and the cooling jacket in the head and crankcase. Even the motors with water pumps would do it, but the slower flow of the thermosiphon has a tendency to build up sludge, especially toward the rear of the cooling jacket in both the head and crankcase. agood fluching by getting water under pressure in through both the upper oulet and the lower inlet can improve things a lot.
Other things to consider if you want to try the electric fan, apart from the fit issue, will be that you'll have to find a place to mount a sending unit and relay to trigger the clutch on the fan and, I would question whether you could find an electric fan that will move as much air as the original.
So that's what I'd offer as free advice. If you do go for it, I'd love to hear/see some pics of how you did it and how it works out.
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