I'd run a compression test, but it sounds like blow by from worn rings.

Try the other end of that hose of the PCV valve. I had it clog going
into the carb and was getting blow by because it had no place to go but
back.

Bill
'55 President
'59 Hawk
'60 Lark
'70 Avanti
'71 Avanti

 If you are talking about the stock gauge, and it's connected to the
manifold, those figures are vacuum, (inches of Mercury); and don't sound out
of line.  You will only see pressure, (PSI), with wide open throttle; and
you shouldn't take your eyes off the road then, anyway.
 The two R1 & R2 breathers have lots of holes around the rim; but there are
only two holes, about 3/16", inside, that allow air to enter the valve
covers.  These are the "metering holes" sometimes referred to.  You can
check them by looking up inside the breather.  The retaining clip might be
turned so it covers them.  It's supposed to be turned so it doesn't!
 In the stock R1 & R2 system, oil return to the crankcase is supposed to be
aided by the flow of air in the crankcase ventilation system.  It goes from
the valve covers to the valley, to the pan; and out the vent stack on the
side of the pan, to the PCV valve at low speeds, and the air filter housing
at higher speeds.  There are baffles inside the stack to help separate the
oil.  The stack and hose to the air filter are large enough to slow air flow
so that can happen.
 Do you mean you are using the R3 carb enclosure, with the R2 PCV valve?
The valve should screw into the rear of the carb base and you would have to
pass the tube through the bottom of the box .  You don't want to leak
pressure out of the box; or into the PCV hose.  I don't have a picture of
the parts Stude used on the few cars, (maybe two or three), they built that
way. R3's for California, (and New York?), used a PCV system.  Most didn't.
They used extra, unrestricted, breathers on the valve covers, a total of
four.  The vent stack had another breather on top.  It doesn't look like
internal flow was a consideration; just a lot of  pressure relief.
   Of course, you could have a hole in a piston, or the engine may be so
worn out that it produces too much blowby for the system.  Do large amounts
of smoke come out of the valve covers, if you take the breathers off?  Do
you fog the block when you drive down the street?  Do people tell you your
car is on fire?  Hopefully the answer to all those questions is "no"; and
you just need to make the improvised PCV system work.
                                                                    Mike M.