I'm going to find hard with parts costs, because I have a friend in "the business" and I get a very good rate. But, overall, this is probably going to be put on the road for £3.5K, including buying the car. Toys such as silly exhausts, ally undertrays and silicone hoses ..... all extra! I could have bought a working one for not a huge amount more than that, but that would have had 70K and an unknown engine. This will effectively be a brand new engine - the only thing "old" in the bottom end will be the main bearings.
To strip and rebuild the engine, even if nothing is wrong with it, you need:
- Cambelt and aux kit - not cheap when you include the water pump and all the idlers.
- full gasket set - again not cheap - Alfa workshop are listing this at £222
Pistons and liners (retail) - £280 a pop, you need 6 (EBspares). Valves are £20 a go, and if you have bust loads of them, it adds up.
I think you need to ask why the 3.0 needs reconning. If you are just replacing leaky stem seals, then you can probably keep the parts below £600 - cam kit and gasket set. If the bottom end is toast, then it will get expensive very quickly. I would guess that a full overhaul price would be in the region of £2K for parts at retail prices.
Why did I do it in the car? Mainly a question of space and mess. I have a decent sized garage, but that is full of other cars and stuff. The engine stand has a big air cooled diesel on it (I need to knuckle down and make a full gasket set for it...). Doing this with engine in keeps the mess contained "within the car". The only downside will be the build of the bottom end - mucking around with that sump is a nasty job. As discussed upthread, I didn't want to get into a rebuild of everything at the same time. If I had dropped the engine, I would end up doing the clutch, fitting a Quaife, doing the ARB, doing the suspension .... and it would all get a bit silly!