[FirstOwner69]

My original 69 Chevy CST/20 2WD has a 350 and A/C. I'm not sure if the 396 would be different in regards to the valve. I'd think not. Mine does have a valve. It is not attached directly to the inner fender. Rather, it just lies on it and is held tight by a heater hose clip that is used to hold the heater hoses tight to the inner fender adjacent to the valve. I bought a clip like this from Classic Industries. The clip is not screwed to the inner fender. It has two tabs on the back that are spread to secure it in a 5/16" or 3/8" round hole (I don't recall which size). I believe the 70-72s use a different valve that allows it to be attached directly to the inner fender. I'll attach a picture I took before I started my restoration. You can see the valve and clip (both rusty) just to the left of center near the bottom of the picture. Sorry it's not a better shot. I hope this helps.