I think twisted 6 was getting 1000.00 to prep a 292 crank for a 250, please correct me if I'm wrong. And that will buy a lot of nitrous. Or, a really nice blow-through turbo carb and hat from CSU. Or, a used HX40 off ebay and a SPA T3 turbo manifold. To say nothing of the custom pistons you will need - which will undoubtedly have the wristpin up in the ring pack, drastically reducing piston life.

Typically, the guys running that setup were roundy-round racers looking to hide their larger displacement engines to circumvent the rules somehow.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."