Would it help if we padded the prefix so that the rest of the files are aligned to the block size of SHA1 (512bits), so that the crafted blocks are still block-

Would it help if we padded the prefix so that the rest of the files are aligned to the block size of SHA1 (512bits), so that the crafted blocks are still block-aligned? Or does the different initial state (due to a different prefix) break any chance of re-colliding with these specific files? (i.e. you'll have to run the full brute force attack again with a valid git blob header as a common prefix?)