pushrod size for mopar cam


I have a 1971 340 block, J heads with stock double spring.
I purchased a purple cam ( advance dur 268/272 dur @50% 228/231 lift 450/455). part # P4452761
Block was decked 10mil
heads where also shaved 10mil
Can anyone tell me what push rod size (length) I should be using?
Author: admin