Good luck in tracking that noise down. One thing I found makes it easier to R & R the rocker shafts and line up the pushrods is to use a pair of 8 inch long bolts to position the rocker shafts while you line everything up. You'll have to remove them to refit your shaft studs or bolts of course.
That save me a lot of time when I was messing with my geometry and pushrod issues. I run Manton's Stage 5 - 7/16" pushrods with Custom T&D rockers on my Indy EZ's that were beautifully repaired and prepped by Fast68Plymouth. All my 3/8" pushrods were contacting the intake port casting prior to Dwayne going over them.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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