Help! Need a Buick nailhed exhaust manifold measured!!!!!

Putting a 66 425 nailhead in my shoebox and the manifolds im using right now are real right, and im thinking this other style might be better, but I dont have it on hand to try it out. Maybe someone has one that they can measure? Or sell me?!! I attached a picture to try and show what measurements I need, hopefully people can understand it....if not i can try to explain the measurements i need better. The driver side is the only side im having clearance issues with.

 

I,ll snap some pics tonight of my 425 in my merc, darn drivers side! ended up making a pair of headers last week.

 

here's some meas. A=16.5
B=15.75
C=2.5

hope this helps

 

thanks alot!!!! when i go to the garage tommorow, i'll now know if the kind of manifold will fit better than what i have now!

 

The manifolds from 364-401 and 425's will interchange. All the earlier ones wont.

 

slightly different application but heres pics anyway.

 

if the manifold you pictured won't work, consider peerhaps a59 401 manifold
http://www.google.ca/imgres?q=1959+buick+exhaust+manifold&um=1&hl=en&sa=N&rlz=1R2GPEA_en&biw=1680&bih=912&tbm=isch&tbnid=CHPK0mBw5RdGxM:&imgrefurl=http://1fine59.com/%3Fpaged%3D3&docid=-aeC_Vy0IX4HkM&w=800&h=602&ei=11WNTqGZAaOesQLrwrmNAQ&zoom=1&iact=hc&vpx=375&vpy=149&dur=11169&hovh=195&hovw=259&tx=178&ty=92&page=1&tbnh=138&tbnw=183&start=0&ndsp=43&ved=1t:429,r:1,s:0