If you're pulling a V8 from an explorer, it'll be a fuel inject 5.0 302. If you pull a V6 out of an explorer, it will be a 4.0. You can convert the 5.0 to carb status and run it like that, all you'll need is new motor mounts and a different transmission bell housing in order for it to fit.
-1966 Ford Mustang Convertible "Lucy" 200ci Inline Six with C4
-2000 Ford Ranger "Rick" Extended Cab 3.0 V6 Sport Model XLT