Build ?S
I would build a 383 if you want to use stock castings. A 396 will want something like AFR's or TFS casting which you dont want to use because of cost. The resason why i say AFR or TFS is because they are bigger heads and can support a bigger motor.
I would go with a le3 or AI 200cc topend setup and a forged 383 bottom end. Use a nitrous piston and ring setup and you will be good for a 250hit. Most guys who say it will never go past a 150 shot often do, this way you will have some growing room.
Just make sure to get a good piston, they are essential in any n2o build.


