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I was getting ready to build my motor for the track I run at but just got told they shut it down. It was a 3/8 and we had to run a 2bbl and the car had to weigh 3500lbs. The new track I'm gonna be running at is 1/3 and the car has to weight 3000lbs and we must run a cast iron block and heads and we are allowed to run a 4bbl. The rest is pretty much fair game. What's gonna be the best engine for this?