Well all of your parts are very vauge. Example, there are $150 headers and $700 headers. Which one are you wanting? Things need to be alot more specific. What about all your hardware, studs/head bolts, gaskets. Not sure how close you want for a budget.
I can atleast say the following...
F54/N42 block- You should be able to find a block for under $150. That would include going to the junkyard, driving somewhere to pick one up for cheap, buying one locally for way to much, driving to pick one up for free, etc. Ive gotten rid of 2 block (n42 and f54) I scrapped one, and sold the other for $50. Overall their cheap.
Turbo Exhaust Manifold- Good condition, no cracks, usually goes for $50-80. Ive sold one in that range, seen many other in that range. Expect to pay around that. Ive seen them go higher and lower but most are around that.