Several months ago when I changed to a standard rocker cover I was told the standard non vented cap is what I should have.

But now thinking about it shouldn't I have the standard vented cap?

My venting setup is pictured below.

Cheers

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

You should have a vented cap.

The PCV system cama with a vented cap, but it makes SFA difference which you use really. I found this years ago.
I have a vented cap on the 1360 and a non-vented on the 1412, both run a PCV from the rocker cover into the Weber manifold. No running probs, leaks or mayo with either.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've had no problems either. The only thing I've noticed that I thought might be related is that occasionally the idle will be a little high when you first pull up then slowly drop to normal. I thought this may be as more and more of a vacuum builds up in the crankcase.

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Mine both do that (with a 45 dellorto, only when hot after a good run)- so I dunno. It may be a factor, maybe not.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.