Gonna have to go with a hell no. You have a nice, reliable, comfortable DD, but you don't have a lot of money, but you wanna trade it for a shitty, half assed 240? 1J swap or no, that car is going to be a money pit fast. Besides that, if you have any sort of metal in your right foot (doesn't even have to be lead) you'll end up getting the same or worse gas mileage in the 240. I was at this crossroad a year ago, there was a beautiful, perfect, one owner NA auto for sale for 2k and the turbo car I ended up going with for 2200... In complete seriousness, just trying to keep the turbo car going (failing miserably) has cost me more than doing what I wanted to do with an MkIII originally (HX40 MSII 1J swap), or even what I want to do now (same set up, 7M with mild head work).
Take it from me, stick with the car you know can get you around and save until you can do what you want with it.