[Dodgeboy49]

Wouldn't the Cordoba chassis be an awful lot wider? I'm sure the parts can be made to work (heck, anything can be made to work) but you might find yourself fabricating more than you expect. Besides, you might enjoy driving the Cordoba too much to dismantle it.

The flathead 6 is not a real high-speed engine stock, although people have done very impressive things with them. They run very smooth, are reliable, and have a lot of torque in addition to getting reasonable gas mileage. Adapters are available to hook them up to GM automatic transmissions for not much money, and I know that power brake kits are available too. A/C brackets are easily fabricated, as are power steering brackets although you may find that power steering isn't really necessary. Switching to radial tires helps a ton with handling and stopping. In short, you could probably get the things you want more easily in a nearly-stock restoration with a lot less fabrication. If you put a few hop-up parts in the engine and choose an overdrive automatic you can easily cruise at freeway speeds while still having a very original car.

 

[Dodgeboy49]

Not having the original engine makes using the flathead a little less interesting, though not worthless. The engines are super-easy to rebuild, and the fact that they were used in everything from boats to forklifts makes the parts availability pretty good. Ebay isn't the best place to find speed parts, one of the better suppliers that I have found is actually a Chevy parts place called Langdon's Stovebolt. He carries manifolds and ignition parts for Dodge flatheads.

All that being said, your Cordoba chassis would be a great source of parts if your dimensions turn out right. I'd measure from hub-to-hub personally, if they come out the same or within an inch or two, I'd say you have a winner. If your measurements are right, that says that your tires will sit 2 inches closer to the edge of the fender. You may be able to compensate for this by choosing rims and tires with 2 inches more offset to them. I always thought of the Cordoba as a car the width of an aircraft carrier (not complaining- I love riding in them) and figured that everything underneath would be far too wide for a '47. But then again...

 

[Dodgeboy49]

This is purely a shot in the dark, but you might measure the width of the frames. If the Cordoba frame is wider, you might be able to remove the torsion bar suspension and attach it to the '47 frame, with appropriate bracing. If the Cordoba frame is the same width, you might have a difficulty (but not an impossibility) since the added width would come from longer arms. I'm sure it is possible to shorten the arms, or perhaps adapt the torsion bars to the factory arms. There has to be a solution!