Dont re-invent the wheel. The frames worked great from the factory, why wouldnt they work great for you? Get a different frame from any 36-40 Ford. Hit up ebay, your local classfieds, wherever you can find one. Just get the bare frame. Then you can mount everything from your old frame on the new one. I would suggest getting a better rear-end (10-bolt GM's or 9 inch Fords work great) if your upgrading engine. You can get front-end rebuild kits that'll make your car handle like fresh of the assembly line (back in '36 haha).
The ranger frarme, it might work it might not. What I can tell you for sure, everybody will notice that its sitting on a different frame. Either the wheels will stick out too much or not enough, or they wont be centered in the fenderwells etc. It HARD, very hard to make a frame swap look nice...