Spoke to one of our 'Nam vets today ref F-105: more than 800 by a substantial margin, whilst dodging a bit, but not really sure 'cos he was too scared and the ASI scale got compacted at the upper end if the pitot probes hadn't been shot off as far as he could recall.
He seemed to recall that the B-58 Hustler was no slouch, either. The knackered old T-38 will reach its Vne of 710, still accelerating (limited by rear canopy lift). Not much drag there, either.