The turbos had major problems with the veins in the impeller housing... Ran too hot and ate turbos on a regular basis... Lotta folks just bought after-market 4 barrel intakes and ran 650 cfm carbs and lived with about 140 HP... That was plenty... My Corsa was 110 hp and that was fine for auto crossing where too much power can be a problem...
My VW Karmann Ghia race car, for instance, running a mild 1835 cc engine with twin Webers would routinely show up Vettes and Porsches on the shorter courses...
BTW, I do have a pic somewhere of the back of my 'Vair with the Nader/2000 bumper sticker... Most folks never got it... lol...