I've given it some good whacks with a hammer and galvanized pipe, and this is about as far in as it wants to go. But the front edge it isn't seated as far back as the original was, probably because its a little wider, but there is still a small gap in the back. Can anybody tell if it is in far enough?
Its a Cloyes true roller
http://community.webshots.com/photo/...19229750JOzTXl

 

For one I would not pound it in, heat the sprocket up and slide it on (oven or propane torch) would do the trick.

Put cam sprocket on and chain and check for alignment, if its not straight than the crank sprocket needs to go back further. You will need to look at the side view of the chain and see if its straight up and down, if its off a little you will have problems.

 

Try a ruler or a straight edge to line the sprockets up.Run the flat edge so the face of each sprocket is touching. Can't really go wrong that way.

 

As long as it matches the cam gear your okay.

 

No way to tell from that pic. It needs to be flush with the boss on the crankshaft (IOW, no gap behind the gear).

 

Ditto, it should go on the rest of the way when you tighten down your balancer hub.

 

Mine has a gap in mine as well. I just installed the chain and called it good. It is probably putting more stress than is needed on the chain, but I figured that when I tightened down the hub everything would line up. I used a 3" piece of conduit and pounded the sprocket in as far as it would go and then turned my crank a couple times with some white lithium greese on the chain and then ground down my timing chain cover to where it wouldnt touch anymore. I think you will be fine. I have pictures of my install in my sig.