Which 1968 340 timing cover

I am looking for the correct 1968 340 timing cover and balancer to put on this 1971 340. I have looked at a ton of pictures of what is supposed to be 1968 340's and half of them have the raised timing marks on the right side, and the other half show the timing tab on the right side. Is there any one out there that has an un-molested 1968 340 or anyone that know for sure what cover came on the 1968 340's. Even looking at new one's they show both for 1968.
Thanks
Bob