Just the Alfa bits to repair are over a grand. And having dismantled mine, I can't see how you could do it properly in the car, so theres over a day to get the thing out - and similar back in I guess (mines still sat on the garage floor).
3 chains, two idlers, one crank sprocket, possibly 4 variable cam sprockets, 6 guides, 3 tensioners, 3 tensioner gaskets, new crank seal, while its out, be silly not to change the water pump and its seals and gaskets as it has to come off anyway, sundry sealants, new auxilary belt and tensioner too . . . soon adds up.
Never mind the chasiss bits, brackets, rubber bobbins that you discover on the way are knackered, perished, bust . . .