The 67-69 long branch manifolds will fit (snugly) IF YOU HAVE MANUAL STEERING!
They will NOT fit if you have power steering. The power steering box is about 1/4 inch wider than the manual box.
Now, if you have power steering, and think OK how hard is it to change to manual.
The box isn't difficult, and not overly expensive, BUT the drag link from an automatic box will not fit the manual box.
Unless the drag link has been reproduced (I don't know, I finally found one, and don't need another), they are rarer than an honest politician, and more expensive than the Mona Lisa IF you find one at all.
25 years ago, I spent a year and a half looking, and about $300 when I FINALLY found one! At that point in time, I had made all the other changes, and the car was not driveable without the drag link; its only money!
Jon
__________________
"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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