Yeah its definately seen better days.. it runs better than a lot of carbs i have driven but nowhere near as good as it could be.
There are a few options;
1; The best but rare as rocking horse s**t, fit an EFI setup from a newer engine
2; Strip and rebuild carb hope for the best
3; Get a chinese aftermarket carb, not too bad priced but apparently use even more fuel than standard
4; Get a new genuine carb, $1200, if I had this to throw around I would chuck a whole new engine in
I guess toyota is the best bet for a carb kit these days (prepare for heart attack at price), I remember walking down the road to your local little auto store and ordering carb kits for bugger all..now most of those little stores are closed down