Well the only sound that I know of that an original LT-1 may have over a new roller is the tic-tic-tic of the lifters when cold (or when in need of adjusting!).

The ZZ4 with a good set of ceramic coated headers (good for heat and stay pretty forever – trust me here), 2-1/2” exhaust with a cross over and a set of 40 series Flowmasters with dumps just before your rear wheel openings will be the sweetest sound you’ve ever heard. Not having to fiddle with the engine will be a big plus as well. All of the components have been selected to perform well I‘d even go so far as to recommend a 750 Q-jet and you’ll think you’ve died and gone to heaven the first time you nail it and those big secondaries open.

Keep us informed as you decide!
Glenn