New to me 440, need help with diagnosis

[funknut]

Options include:
1) 5/16" push rod
2) shim the rocker over a little
3) grind the head intake runner.

Thanks!  Ended up going with 3/8" pushrods and took my time grinding the spots that were rubbing.  Plugged the holes best I could with a rag and taped over it to keep any shavings out.  Went really slow at first but got the hang of it after the first couple.  It really didn't take much grinding to get enough clearance.

All buttoned up and everything sounds better.  Still noisier than I think it should be, but definitely an improvement. 

Have a small oil leak from the back of the pan, so will remove/replace and check the gasket, but then should be all set.  Thanks to everyone for the guidance.