Mini tub

72duster72 said
How much would I gain on mini tubbing a 68 dart. As in tire width and I will not be running a 15 inch rim

Op said, "I will NOT NOT be running a 15" rim."

If this means I WILL BE running a 14;
then I see no point cuz what's the biggest 14" street tire you can actually go to the tire-store and put your hands on?
And,
does your combo need more that that?