need to be aware that the 250 aspirated motor has a IP that is not set up for a turbo, your air fuel ratios are too low, but you can bolt a turbo on and not touch a darn thing but the point is to get power and you should easily get 20-25 psi of boost, when i did mine i only got 10psi before touching the fuel system, there are so many things to do once you have a turbo its unreal, trust me, i can get the tires to roast