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Then use this https://www.ebay.com/itm/Chrome-Round-Push-In-Breather-w-Grommet-for-1-1-4-Hole-Valve-Cover/113675282338?hash=item1a779327a2:g:L9oAAOSwGLZcf0AQ:sc:USPSFirstClass!65807!US!-1

However you build the engine just make sure it can breathe otherwise all you'll build is a grenade.

That hole goes straight to the pan, all early sbc's were cast in that manner.

Look at this manifold https://www.ebay.com/itm/Vintage-Offenhauser-1955-86-Chevy-SBC-Three-Deuce-Intake-Manifold-Carburetors/133236916230?hash=item1f058a0006:g:YLgAAOSwa5Rdyf4d

The tube left of...

No, I use the go advanced feature and use the paper clip attachment.

Can you post a picture of the tube? Early rams horn exhaust manifold, left side, had provision for a generator which I think you could make a mount for an alternator. Something like this but may be...

Here is one for I think a decent price. https://www.ebay.com/itm/Chevy-Impala-283-327-Engine-Oil-Breather-Road-Draft-Tube-Crankcase-Pipe-Vent/264527552049?hash=item3d97121e31:g:amIAAOSwW1Bdvdov
...

Probably not being a 65, but if it does there will be a hole just to the left of the distributor hole looking from the rear. I'm not big on running a pcv system on an early block. The idiots in ca....

Yes, you do. Does that block have the provision for a road draft tube?