You can read about this, and see pictures, in the shop manual. If you don't have one, you should get one, or at least read it at the old car manual project, on the interweb. You will need to know how to adjust your tappets any way, they need to be set hot. Plus, after you run your engine the first time, you need to re-torque the head, and adjust the tappets again. If you don't have crowfoot wrenches, you need to remove the rocker arm assembly to reach all of the bolts on the head anyway. Taking them off (the rockers and tubes) gives you a chance to make sure there is no sludge or sediment in the tubes.
Why not drop the oil pan, and look the engine over while it's on the stand. It's a good easy time to become familiar with it. It's really simple in there.
Boy do I sound bossy! You should do this, you should do that. You should feel free to ignore me!
It is a good time and place to start right. The tube is readily available from many vendors, Jim Carters, Chevs of the forties, etc.
