You need to have the proper cup type cam retaining washer on there. The cam gear is retained by clamp load. The key is only for orientation and is not intended to drive the camshaft! Summit sells a engine hardware kit by Dura-Bond that has the proper retainer. 65'
I have the cup washer and it's on there. I just don't want to put the eccentric back on. The ultimate question is does the 1/8" or so thickness of the eccentric matter?
No, still carbureted. Mechanical pumps that can produce enough fuel pressure for what I need are as expensive as an electric and still not as consistent. It's easier for me to manage an electric pump.