5.7L/ABS Donor Car for 1967+ Dart

I'd spend some money on the heads, pre-'09 engines have a reputation for dropping valve seats if engine is overheated.
I'd go with the solid axle, believe it'll be lighter than the IRS on the Charger, and may be cheaper to narrow than IRS.
If you can't find a Jeep axle to use, look at an explorer, Durango, or Dakota. Probably have to narrow any of these choices.
A body rears are very narrow!
Your car will fly even with a stock 5.7, much lighter than that Charger, and Pursuit Chargers aren't aren't slow, I've got an '09!

I talked my machinist today, he's done a bunch of 5.7L Hemis...first thing he said was 'it'll be the most expensive work, but replace the valve seats'

Is the ABS the same for a Charger and a Jeep/Dakota/Durango, and if so, what years/models?

My 'fab-guy' has a jig setup to narrow the IRS, and he's willing to charge me the same for narrowing a 9 1/4 and fitting a 4-link, or narrowing/fitting the IRS (including having Moser cut/respline the axles)