A833 4-Speed on a 4-500hp 440: 18 or 23 Spline Necessary?

hey aj/forms , there is a couple pics in the chrysler magazine ''performance for the chrysler car enthuslast'' july-august 1991 the feature is called ''kings of the salt''on page 49 . there are a couple pics and a description of the mga with the blown 354 in it , went 222.233 mph on gas set a record . but he don't stop at that , kept on it , plant'd a blown 392 in it to get passed 260 mph on gas . and the next pages 51 , have my friends liner , charley markey of the market brothers . that a destroked 291 desoto to 260 ci blown on fuel made 1000hp , went over 300mph . one of my saltflats engines is a desoto 291 with the same head work and roller cam design n profiles . both butch and charley are great guys and a wealth of info n knowledge . just lucky i guess to meet up with these guys and be able to call them my friends .