Should I swap the 3.91's for 3.55 or 3.23

Had some engine issues so I have dropped it off at the local prformance shop so it can be fixed and ready to cruise this summer. The car is a 68 dart with a 340. Has J heads with 2.02 1.60 valves, roller rockers, edelbrock air gap intake, holley 650 DP, lunati 268 voodoo cam, roughly 9.5:1 compression ( I will have an exact number when engine is finished), non OD 4 speed. Tires are 245 60 15. Just a weekend cruiser. I want to make it a little more cruise friendly and am having a tough time deciding if I should go with 3.55 or 3.23 gears. Would the 3.23's hurt the performance over the 3.55's with that cam choice. Should I rethink the cam. Thoughts and opinions needed. Thanks.