Hey why not?
I'd be very tempted by something like that. A nice and very reliable V8 and 6 speed trans would be a smart move IMO.
And if you didn't carve up the engine bay there's no reason you or a future owner couldn't put the correct engine a tranny in it down the road.
I'd keep the colour original. It looks pretty good. Even if its faded I wouldn't paint it unless I absouluty had to.
I've always loved these older Ferraris. A lot of parts are from the same vintage Fiats. With some research you could run that thing almost as cheaply as a modern car.
But first things first. It needs an inspection before you part with any cash.
Can you get it up on a lift? At least there's air in the tyres.