The Granada spindles do require the use of Granada outer tie rod ends but only when switching to the Falcon V8 steering parts. If keeping the six cylinder steering, one could use the adapters from Mustang Steve's site.

http://www.mustangsteve.com/tierodbushings.html

The Granada spindle also to add some bump steer due to the change in steering arm location. There are some aftermarket kits to correct this if you care. It's really not that big of a problem for just cruising around. If you're building a track car, you'll want them.

I'm not a big fan of keeping the lighter duty steering with a V8 under the hood. The V8 center link actually has a small amount of drop below the oil pan. It keeps the steering from hitting the bottom of the pan at full lock to lock steering.

I good choice for a rear end would be a V8 Falcon or any Maverick. The Falcon had the shortest housing Ford offered in an eight inch. The Maverick is exactly 1" longer which can fit but with some tight wheel and tire clearance.