lol,
right might be worth joining RTOC costs 10 quid but well worth it for all the info u get.
a standard engine with a standard turbo with a good intercooler and a propperly set up carb with correct jets, and if u wish bored out centuri at 15psi will hit aound 150bhp, so for spending 60 quid and sending your carb to 1 of the people on rtoc, letting them play with it, and making sure the rest of your engine is fine doing a coolant change, and oil change, making sure the headgasket is fine, and not blown, and making sure the cooling is working as it should, then twisting the actuator arm round u will run 150bhp all day every day, then you can look at other things like new turbo ( t25, t28 or t3) with a alloy or frontmount intercooler, u can run up to and most likely over 200bhp.....
then u need to look at things like stronger liners, and low comp pistons, also stuff like watercooling, but for not alot of money u can have a very powerfull quick car, there are a few high power cars that are on RTOC if u do join look for people like Mart, Colin, Mike48, Sparkey, Bill J etc there are lots of helpfull people on there.