Just off the top of my head.....Porting your stock heads to that level, swapping to that cam, swapping to 1.6 rockers, and the required pushrods would be roughly 2k.
That gets you to just under 500hp(like what they saw)....... if your carb is as good as the Mighty Demon 850 they tested with.
A set of fully ported EZ’s flowing in the 350 range will be in the 3k range, not including the other parts required to use them.
My comments about “you” not seeing the same results are based on you saying the TF heads aren’t in your budget.
If you’re paying for upgrades.......and those upgrades include new heads and/or head porting...... 2k doesn’t get you very far in the BBM world these days.