Weight is the same as a small block engine (340).
Ball park for an off the shelf carbureted alloy 540 would be around $30K.
I took it as maybe the 6.1 he was talking about?
The 5.7 is 56 lbs less than the 360, pretty impressive I thought. The 6.1 shouldnt be much more than that.
To pay someone to do everything for the 6.1 would probably be just under $20k I would guess.