I love the flathead Ford and the now nostalgic look. But I moved on - about 1970 - when they started getting scarce and parts started getting expensive as well. Before I spent $15 very large Franklin pictured greenbacks on a rebuilt original and that rebuilt of unknown quality assembled by an unknown mechanic, I would for sure look at one of the new aluminum blocks or possibly a new and unused French version. Take a look here - Flatheads Forever - these guys ain't cheap, but are one of the better known. A Google will find you a few more flathead engine builders. Now, with that said, you can buy a Chevy() or Ford small block crate engine, fully assembled, brand new, dress it out for a few hundred more, have better reliability, more horsepower, and costing in the neighborhood of $3-5000. The rest of the saved money - that can be invested elsewhere in your vehicle.

Now, since you didn't say how much you had to spend on an engine, and if the flathead really gets your personal motor running - go for it, just do it the right way with premium parts and services