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Old and sorry if posted before.
This guy has done some nice videos with that three hundred, starting a few years ago.
Here is a playlist. Didn't see the 440 rebuild there, don't know maybe it is there.
Video brings back memories of when I did the exhaust system on the Monaco about 8 years ago with my own mufflers and by my self. My recollection is they sent me the wrong rear hangers also and I needed to wait to do the install but then it went smoothly. I'd highly recommend this system.
My '67 New Yorker has Flowmasters (dual) that the previous owner put on. My choice would have been to keep it purely stock, but I didn't see the need to remove a perfectly good/newly installed system at the time. It has grown on me, the subtle rumble is nice, it has great pick-up, so I'm leaving well enough alone. Good luck with it, looking forward to hearing how it sounds.