How much power are you after?

I did wonder about gearboxes as I've modded my drivers inner wing for end of block engine mount as per focus, but if I switched to duratec using same mount dunno what box I'd need.

I've currently got ib5 box mated to the blacktop mondo engine. Rear starter to suit blacktop and keep it away from exhaust, I'm also using the blacktop aux belt setup with alternator on bulkhead side, which needs a lot of trimming to drivers inner chassis, but means its simpler once done and much tidier.