You mention the 2.5V6 as the donor is cheap - which is true, but then you want to add cams & ITB's, which will also need an ECU & possibly pistons, which I would budget at least 4K for? If you want an Alfa engine, then get the 3.2V6, which will give you more power/torque than the tuned 2.5V6 and although the engine is not cheap, you can get them for under 2K.
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