Quote from article above..
"From takeoff to the time I started thinking about turning out, not more than a minute and a half had passed. As I started the turn, I glanced at the altimeter and it showed an amazing 6,000 feet and building rapidly! No wonder the airplane held the takeoff-to-10,000-feet record for years. Supposedly, with a honcho on board instead of a pasture pilot, the Bearcat will reach 10,000 feet in 91 seconds from brake release. We were well up into the century series fighters before a jet finally beat it."
So yah crazyflak the 60's jets probly beat the hell outta of the bearcat from 0-30,000ft.... But it still owned the jets from 0-10,000ft not bad for some late war 1944-45 design.