Blue Print Hemi

I have a 73 Duster with a 340 / 727 / 3.91 Its been sitting for a long time and I would love to get it back on the road. I love all the projects you guys are building and would love to have a modern Hemi, or the 408. The 340 is ok but not making power like these crate motors.
The main question I have is did anyone install one of these Hemis yet. I looked but cannot find.

The crate Hemi is expensive but once I start adding the cost of building a junk yard motor of factory crate. The warranty and reliability it kinda makes sense.

What is the preferred mounting system? Headers

Thanks everyone