Cletus - According to the 1929-54 Chevy Master Parts Book, the left intake rocker is listed as casting# 839465 (on the part itself), but identified as GM# 839463 by part number.

There is an NOS set of 3 rocker arms currently listed for sale on evilbay. The listing provides the right part number and pictures show the correct casting number, but the title of the ad lists them incorrectly as "Exhaust" rocker arms.

This would give you 3 new rockers for your engine, all it needs. wink But maybe the asking price is a bit steep? Possible there may be some 'Bolters out there that have some usable rockers for you. Will have to see who replies. headscratch

On the push rods you need, how many??? Once you let us know I can try and locate some sources and post them here for you.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)