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Not that much money...have you addressed suspension yet? If I were you and had the budget, I would do a built bottom end, and a TFS heads/Stage 2.5 CMS blower cams combo.
A good friend of mine is making over 600 rwhp out of a 2V. Close to 700rwhp on spray. He has well over $30k tied up in the entire project. I'll post his mod list of you're seriously interested.