Mike, A bit of snooping through the GMpartswiki site came up with this page showing the timing sprockets and chain data for your C50 w/350 V8.

GM# 3735411 - Chain, camshaft timing

GM# 3735413 - Sprocket, crankshaft

GM# 3735412 - Sprocket, camshaft

I did a quick search of eBay and found a number of NOS items being offered, if that's the way you want to go. The below are just a sampling of what I found.

NOS Chain and crankshaft sprocket offered together

NOS Camshaft sprocket

NOS Chain

Best of luck sourcing what you need for your engine! thumbs_up
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~ Dan
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