Hi
Just wondering if someone can confirm for me the correct source of manifold vacuum for tuning my Rochester 4bbl on my ‘69 350 HO please.
I have the front valve fuel inlet type WITHOUT the manifold vacuum port below it and divorced choke.

Does this mean I just disconnect the brake vacuum hose and use that vacuum port at the back? If so, do I need to block the “T” section on the trans vacuum?

Or am I missing something really obvious?

I’ve put in a couple of pics of my carby:

Thanks