how much slop are talkin about?
the majority of the valves should feel loose on the pushrods with just the pressure from the lifters spring holding the pushrod against the rocker with the exception of the valves in which the cam lobes are in the open position, now if the pushrods are falling out of position, thats too loose and in that case did you change any components?
used lifters should be bled down before tightening the rockers as to prevent piston to valve interference, you can do that in a vise with a small bolt and pump the oil out little bit at a time.
the majority of the valves should feel loose on the pushrods with just the pressure from the lifters spring holding the pushrod against the rocker with the exception of the valves in which the cam lobes are in the open position, now if the pushrods are falling out of position, thats too loose and in that case did you change any components?
used lifters should be bled down before tightening the rockers as to prevent piston to valve interference, you can do that in a vise with a small bolt and pump the oil out little bit at a time.