I can understand complaining about an SBC in a Model A Ford, but a Chevy in a Chevy? Now you're just nit-picking.
Have you priced '50s-era hemis? Ten times what an SBC goes for. You get so much more HP for your buck with an SBC. And parts availability is crucial if you're a driver instead of a poser.
SBCs don't have to be cookie cutters; no other engine has the wealth of vintage speed equipment available, from Potvin front-mount blowers to 8 deuces on a cross ram.
But go ahead and spend twice as much to go half as fast. I'm sure you'll feel superior with some esoteric mill hidden away under your hood - until you break down in BFE and need parts, that is.