Big inch built for torque, not only less parts breakage but IMO much easier to make the car consistent. With that said, the nitrous will negate the less parts breakage point.... Go shopping for a used aluminum big block and a good machine shop to do the block work. Build a ton of torque, leave the bottle in the shop. Probably save you money in the long run.

The first rule of racing (any form of it) is that before you can finish first, you must first finish!!!!!