Engine/power wise, you’re probably best off making sure everything is working properly as a start- the cam is probably an A cam, so not much scope to improve there- a V cam has slightly more lift but not enough to make much difference. You might find a k or h cam if you’re lucky. A Weber carb kit does exist, although tuning a n/a car costs quite a lot for the power gained. Obviously I’m going to say turbo swap
Dr Car Polisher