Are girdles generally added for big rpm or HP or torque

I now have a mega block and a Keith Black block but my last stock block 440 ran (275) 8 second passes in my 1991 Daytona but it only weighed 2450 pounds. When I took it apart I found a crank going up thru the block. I had 1000.00 in that block for all the machine work and balance job. Heck the block wasn’t even sonic checked. Nothing fancy and it went a quickest pass in the low 8.60’s.