Hard to place an exact number , everyone has different ideas on how they want it done. I just placed an order for over $500 just for things to hook the AC from the compressor to the vintage air box. Some guys don't want ac, power steering, engine dress up things etc.
Here is a link to modern muscle, they have a lot of experience in hemi swaps, there is some things you can find cheaper. But gives you an idea on a lot of popular options on swap parts. Its not cheap
https://www.modernmuscleperformance.com/category/hemi-efi-conversions-resto-mods