charcoal emmision cannister?

[plagee]

Hello all, quick question on the charcoal canister located under the battery on a 71 C10. Was this a California emission requirement? We are in Illinois and I do not think this needs to be reinstalled or is this one of those rare parts that might add a little to the truck. A little history: I picked up this truck to have the kids learn on, the truck was supposed to be a driver with not much work done to it. We are now in the middle of a frame off restoration... Anyway I am looking for info on this canister, if its needed, where can I get a new one, etc. etc. Next question, any thoughts on having retapping the crankshaft for the harmonic balancer bolt. The previous owner had installed one of those cheap chrome timing chain cover that leaked, once changed I found that the threads were stripped, I retapped the crank, and the balancer is back on but I am not sure if this is safe, any thoughts?