Would like an estimate

Assume the engine and trans are in the car. As is the rear end. The rear end has a "large Chrysler" yoke.(I think that is what it is called) The drive line would include the fitting that slips in the trans, the front u-joint, the front fitting welded to the prop tube, the tube itself, rear fitting welded to the prop tube , and the rear u-joint .
Hopes that is what you need.
Mike

AKA, driveshaft.

Easiest thing to do is find a driveshaft that has a 727 slip yoke on it. Find a shop that can shorten and balance it.

The rear U joint, if the shaft and the rear yoke are the same is a matter of buying the correct U joint.

IF the yoke on the shaft is a different size than the one on the rear, buy a conversion U joint, it has two caps one size and two caps the other size. Cost is dependent on what the shop charges to shorten the driveshaft. U joints aren't that expensive.

I had my shaft shortened, balanced and installed two new U joints for around 140.00