Weird timing and power cuts out at 7/8 throttle

[nrwphoto]

I recently posted about mounting a Weber 32/36 backwards on my 87' EA82. I have since installed the remote EFI air filter box to get better filtration on dirt roads.  I used  2" PVC which should give just a little more volume than the Weber can pull.  Problem is the car runs and pulls fine unless I floor it at which point it falls on it's face and chugs.  7/8 throttle and it pulls fine.  I am thinking that it is not sucking enough air and loading up at full throttle so I might try going to a 3" pipe. Ideas/Opinions?

 

Second problem.  While trouble shooting the above problem I decided to check my timing since I have not done that since I had a mechanic reseal the motor a few months back.  With the vacuum advance disconnected and plugged warm engine at idle it shows 23 deg. almost off the timing marks.  If I adjust it down to the factory 8 deg it won't even run, it starts to stumble at 14, rough at 12 and then dies at 8.  If I put it at the recommended max of 16 deg it idles ok but has no power on the road.  I checked to make sure the timing marks are right and the distributor is installed correct.  I pulled the plugs, cranked it with a wrench to 0 deg on the fly wheel, verified TDC in the #1 spark plug whole and the distributor is showing just a few degrees before the #1 contact which is correct for it's advance setting.  So what is wrong here am I missing something?

[jono]

i'd be running it without the air filter stuff on a damp day to avoid dust intake and see if still bogs at 7/8 pedal. I run mine at 22deg but is on 109 octane fuel. Also use 2" or less piping to remote air filters and never had a problem

[nrwphoto]

I put the small Weber air filter back on and the bogging is gone.  So I am guessing it just can't suck hard enough through the 2" pipe. I'll mess with it in the spring. Not much dust to worry about with a foot of snow on the ground.  Timing still doesn't make much since but I split the difference. It runs smooth so I guess I just need to leave well enough alone at this point.