Could you imagine a 48* R3, with Indy heads/intake, Hughes Engines 4.180" crank, 426 cid., ATI F1R Pro Charger (water/methanol cooled), 10.0:1 comp, and brass balls?
Or a Legend Hemi with a Roots blower, stroked?
A little over the 10K budget but when you want max hp you don't care about budget.
And Vette, who really cares what these car had when they left the assembly line if you're resorting to all this. If you are concerned with factory equipment you probably aren't going to be going for 1,000+ hp anyway.
Again, either way you go, you can potentially build the faster engine until someone else comes along and tops that. There is always someone faster than you and it could very well be a big block or a small block. Now go ahead and say THAT is lame. It's still true.