lineslinger Your ideas are all good but here's the problem, IF the car stays on it's wheels the gas stays in the carb. No major problem Kill the ignition and hope the motor is not too hot to light the gas in the carb. Depending on the carb and if it has vents, you can hose them together and be in pretty good shape.
Roll over is a whole big problem, any
oil or gas lines break and a hot motor, you are getting a fire. Your safety equipment is the most important thing at this point. A 10 pound Halon system will give you about 10-15 second to get out of the car.
Master kill switch will help, I like the push, pull switch over the turn switch, easier to hit it in a bad accident. This will help to a certain point but you still will have fuel pressure in the lines between the carb and fuel pump 5-6 psi. maybe 4-8oz of gas.
Oil lines also with pressure.
If you are going to race, buying the best nomex suit, underwear,helmet with Hans brace, shoes, and gloves will give you the best chace of coming out in 1 piece. Rick L.