Radials are tough with a stick, you have to slip the clutch alot to get them to not spin out of the hole. I was able to get a 1.53 60' on the radials but not very consistently, it took a long time to get to that point and if the track isnt on the money prep wise, forget about it.
I put a 28x10.5s mickey thompson on the car and first pass off the trialer i think it was 1.56 60' and 3 passes in with no changes but a higher launch it went 1.49 60'. Its alot easier to drive the car with the slick, just drop the clutch and grab gears.