Bullsh*t, you can do it for under a grand. Do a Magnum swap if you want EFI. Still about a grand. The way your talking about dropping ridiculous coin on projects, your gonna have a hard time with a hemi swap, and you damn sure aren't gonna be done by next summer. Keeping it real homie. Every other response is head in the clouds time. I'll be that guy.
Good points here...... it will, without a doubt, cost probally three times as much to convert to a EFI modern hemi, as it would to rebuild what you have...But if that's what you want, its cool, go for it!