Engine Rebuild

I need my 67- 1500 engine rebuilt. Its the original engine so dont want to just replace it.

I would like:

Engine rebuilt and detailed
Twin Carbs
Unleaded conversion

I am located in Croydon but will travel to get it done right.

I would lke the gearbox painted/powder coated also, may have it rebuilt at the same it if its not too expensve.

Any recomendations?