Josh, what is that 350 making... maybe 350 hp tops? Yeah that ain't cuttin it any of these events short of a GoodGuys Peanut.
The road course requires decent power. The Speed Stop deal requires decent power. And from what I saw of the RTTC4 autoX course setup, that was a pretty straight layout with horsepower getting real advantage. So I certainly see your point.
You can get 500hp easily out of a 383 SBC and it will be not be some radical race motor. stroker rotating assemblies are dirt cheap, get some decent heads and top end and there ya go. 150+ more hp it appears.
Not saying an LS isn't cool, but everyone loves to recommend it so quickly.
And as far as the advice of buying that 377 (no offense to Beach Cruiser) from all the way across country (um, shipping costs?) but why on earth would that make any sense whatsoever? Did you see the parts list of that 377?
Josh, I saw your times... you seem to be doing very well with what you got. I'd want more power too.
Question: what is your ultimate power goal? 1 year? 3 years? 5 years?