Stock Pushrod Length

[StreetRacin89Stang]

I have replaced my lifters, pushrods, and rocker arms and i still have a valvetrain noise comming from the #8 cylinder area. I think the car has had valve jobs done in the past and therefore there could be gap in between the rocker arm and the pushrod/valvestem. To close this gap i am going to need the longer length pushrod. If the stock pushrod is 6.25 (summit lists otherwise) then a .010 longer (6.260) pushrod will make the gap close and not have too much negative gap, right??? Where can i get a pushrod like this??? Please Help!!

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89 5.0 GT White w/Blue Racing Stripes
K&N, 73mm Mass Air, Ported and Polished Stock Heads, E303 Cam, MAC equal Length Headers, Off Road H-Pipe, Borla Mufflers, Sway Bars, Strut Tower Brace, Subframe Connectors, Eibach Springs, Koni Adjustables/Reds, Pony 5 Stars, 1000 Watt JL Audio System, No P/S , No Smog Pump