is this true about a 350 sbc vs a sbm

I used to rebuild engines before going back to school. Could have had my pick of anything I wanted. I kept 273's, 340's and 383's. I used to give away high nickel, 4 bolt main, forged crank 350's all the time. Would only last 70K in a 70's truck. I rebuilt a 370 HP 350 crate motor, came from Chevrolet missing one top main bearing, for a friends Camaro. He even had angle plug heads, good thing I cc'd them, they had been repaired and the chambers were so far off I was amazed. It had the factory solid cam, forged pistons and all. My 273 would clean his clock. After 3 years it was shot. A SBC can run as fast as a SBM and hold up. All you have to do is get aftermarket heads, a Callies crank, aftermarket rods, and shaft mounted rocker arms. As for cheaper, no way. We get all that for free. I also have seen big block, 4 speed Chevys run 18 seconds in the quarter. Not worth engaging Chevy goofs.