Just ordered my R-3035 tonight and will be upgrading it to last past my life time.
I did it this same conversion from the same company on my 69 vette almost 10 years ago and works flawlessly.
Just installed a pair of Delta Flow 40 Series Flowmasters replacing the TTI exhaust Dynomax mufflers.
So much better. Check out the video on my YouTube channel.
https://www.youtube.com/@CBCM1942