2.5" exhaust vs 2.25 or even 2"

I did the stock resto 25 years ago with my 65 Cuda. I plan on just having fun with this one. Likely put numbers matching motor under bench and build a stroker. Gojng for a period day 2 vibe with this one. Just like before getting married.
I hope you don't mean you want to put old school exhaust on there.:realcrazy: lol Stroker = first step to old school fun. :) Now make sure it breaths and you can have even more fun. ;) You can get that old school sound by choosing the right mufflers.