Induction kits will give at most 10bhp but depends on the car in question, some may give zero! How it is fitted will determine the final results.
Turbo charging is for big gains and for big bucks. As already said a nasp engine will need alot of work to make it accept a turbo charger, assuming there is room in the engine bay for it and the intercooler. Compression ratios will need to be altered and pistons machined to achieve this. There's always supercharging, but that has its issues as well. Nitrous is another, but only good for short bursts and well maintained engines, NOS is not cheap these days.
Always best to use a donor vehicle that uses that configuration.