The one improvement I would make on the older 3 litre is not a higher gear etc. But to rid it of the painfully notchy selection.
How that could be done without changing the box is beyond my limited knowledge the the gearing above the hill start 1st gear are more than accommodating.
Not really fussed about an auto box myself I'll leave that to others I don't think it would suit the car myself especially the additional weight of an auto box.
One thing that really peaked my interest the other day was seeing the same engine with turbos in Noble guise pushing out 500 bhp but that'd be silly, well in my hands it would....
I always fancied a Roadster when I first read about them, as I now have one I should really get used to it before having naughty thoughts.