Sorry to hear that... your supercharged V6 was amazing!!
Was the cambelt failure due to the excess of power? I would like to know if Autodelta or others keep the original cambelt in their 3500cc or supercharger conversions.
Now that you have to rebuild the engine why dont you try fitting high profile pistons, lightened valves and rods, etc...? You could make a bomb proof engine and it wouldnt cost you much more.
In any case, good luck with that engine. Hope to see you soon posting new upgrades, great work Seb!!