what width rear rim ? That will affect psi . Do you have radial valved,tight, rear shocks ? Did you alter rear shock settings going to radials ? What sort of power/ ET ?
Whatever works for your car is best .
For what its worth , with Hoosier 275 radials I ran 17 1/2 - 18psi on a 8" rim . Similar with MT ET street radials . With MT Pro bracket radials I went to a 10" rim , with the 28x10.5 I ran 18psi , I now run the 29.5x10.5 version @ 19 psi . Looking at launch pics may even prefer another 1/2psi or so .

Oh yeah I was running 1.42-1.48 with my 505 , with my 440 I am around 1.5-1.52

Tex