If you are needing to add that much weight, may want to consider adding bars to your rollcage in additon to ballast. Each foot of tubing will add 5-6lbs and it will begin to add up.

FWIW,
Depending on who is operating the scales (i.e. how level they get em), I run between 75-100lbs of balast in my Turbo "S" to make 3250 after a race. 3-4 lead bricks bolted to floor behind passenger seat. I have a fairly complete stock interior, functioning A/C, stock bumpers, etc... a road legal and licensed car. I also have about 75 feet of tubing in my cage. Never gone too crazy with gutting stuff, cause I knew it would come back to get me in ballast anyway.

 

1.75" x.095" tubing weights about 1.75lbs/ft.

 

yeah, whatever it is, i forgot. lol i think fuel in the 5-6lb/gal range.

better to add weight for something useful. looks like only a bolt in auto-power/safety devices cage.

 

I don't like the idea of 250lbs of ballast. That is ALOT of weight. Maybe you can just add back certain things to the car.