5.7 swap just want easy. Help

I don't believe the RMS suspension works with an 8.25. I believe it's only good for the 8.75 or Dana.

Simple would be a carbed engine, with the tubular front, and stock transmission. It's not necessarily the cheapest utilizing a tubular front suspension. The only "new tech" about it would be the engine is more efficient compared to a small block but you're still going to be working with a carb. I guess you could consider the coil overs as "new tech" but it's debatable if that's really better than the torsion bars (a can of worms I don't want to open).