Making my race car slightly less of a race car

I have a 1969 Dodge Dart Swinger 340 that has been a race car for almost all of its life. I enjoy bracket racing it and it runs pretty well with old school technology. Runs consistent 12.0 to 12.1 with a best et of 11.89 years ago.

My local track seems to have more events set up for street legal cars than bracket cars any more. I was thinking of re registering it for the street and maybe cruise on the road occasionally.

The car is fairly light and comes in at 2950 lbs. I would like to add a few things but don’t want to gain too much weight. Carpet , passenger seat, maybe back seat if someone wants to squeeze past the roll bar. Speedometer Gaige cluster and wiring up the running lights. Currently has plastic drivers seat with cover on it. No other seats.
Secondly I would like to go with smaller rear tires or drag radials. Currently it has 30x 13.5 drag slicks. Was thinking 28x 11 size would be better Rear axle is shortened not sure of the total width.

I don’t want to slow the car down just make it nicer. Not making it a daily driver just street driven race car.

Any advice or ideas.