Your best options are the 18rg or the 22r. The 4ag and the 2tg IMO are just a bit small for the car. plenty of people getting really good power out of 22R (especially in the states). If you get this in time, there's an 18rg plus gearbox going on fleabay for a little more than your stated preferred budget, but it is a practical bolt in. 4ag and 2tg will require xmember changes and I'm not sure about the 22R. There's a possibiity that you could go 1gge (not a typo, not a 1ggte), but you are again looking at more engineering to get it in.
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