head gasket problem

My car is a 1970 grand prix SJ , 455 ho 4 brrl in it , the head were redone 2 years ago . I did a compression check on it and chamber number 5 is dead . I`m getting ready to replace the head gasket on it again and take the and take the heads in to get a valve job so can one tell me what the comperssion should read at ? thanks

the final numbers are unimportant (well, assuming all get over 100psi) but the variance is important - gm allows I think 25-30% high hole - low hole on those motors. I like to keep it below 20 and indeed typically have 5% or less on my rebuilds