Depends on your budget, capri 3.0 carb, decent air filter, 4-2-1 exhaust manifold and decent exhaust should see 120ish, if you can afford more, get the head ported, high lift cam (rl31 is a good fast road profile) and some headwork should see a bit more. Then your in twein carb territory, twin 45s, ported head head with bigger possible bigger vales, and by now I'd say some work to the bottom end (a good balance, possibly bore it out to 2.1 litres with cast pistons) could see as much as 165bhp. That will give a great fast road engine. If you can afford it, you can get 220bhp out of a 2.0 for £12k! Or even more with a long stroke crank, injection and race fuel, fuck it, go all the way and fit an alloy bottom end and take it to 2.7 litres!