What size fuel tank ?

Converting from flathead to clone, what size fuel tank do I need ? Will 2 1/2 qt work ? Little pushed for space on an older chassis.
You should be fine with a 2 1/2 qt tank as long as you dont have a lot of cautions in a 20-25 lap race.
2 1/2 qt tank works fine for me with a clone motor even in a 50 lap race with several cautions
Just a thought, get the biggest you can fit, because you might be able to use the extra capacity to add more fuel to make weight if their scales are a few pounds light.
We took the 2 qrt tanks on our box stock class and ran 100 laps few cautions too but they made it. Barley but they did it I was surprised