Rollers rattlin
 

Hey guys im needin a little help. I put a new 347 long block from Coast High in my stang and the number 8 cyl valve to roller has enough slack in it to put a dime between em. Its got comp cams 1.6 rollers on victor heads,non adjustable stud mounted. Whats the best fix here? Shim under the nut, longer pushrod, dead lifter. I run it for about five minuites and all the other lifters primed up good so it oiling ok. Thanks