I also had my engine drop a bottom end. Although yours is a top end failure.
If you have a weekend you can spare £200 and get a replacement engine. After donig all that and replacing the clutch I'd fitted a new engine. Its took me 40 hours in total to remove old engine and fit a new. But I did it on my own with alot of faffing. Ones of those days was rebuilding the new engine with some new parts like sump and bottom end bearings.
You could do a complete LFL swap in a weekend though I believe.
I spent around £300 in total inc fluids and it leaves you with a load of spares should you need them.
I then sold the cylinder head from the old engine and ancillary parts for £120 total.
So the rebuild cost me around £200. Its labour thats the killer though. If you can do it yourself though there is no reason to throw it away.
You'll spend just as much time taking bits from the car to sell the seats and wheels and then be left with a shell that no breakers yard will be that interested in.
Alfa 166 2.0 Twinnie - LPG and a few trick performance parts