Turn up the stereo!! On the other hand the rocker nuts should bottom on the studs. Pushrod length may be wrong if that doesn't take all the play out. You can work each one individually by loosening it while the engine is running and then run it back down to the right position. The bolt holes in a 351W head are larger than the bolts for a 302 also. You should have bolt sleeves or have retapped the block for larger bolts. That won't affect the lash but could affect head to block alignment.
74 Bronco Ranger halfcab w/toys: lockers f&r, wristed arm, C4, D20, hyd assist steering, 37"MTRs, warm 302. Capability, that's what I'm talkin' bout.
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