"Just one more time, why is it that the engine is set back like that?" Mostly it had to do with the front suspension and engine choice. The Jag front suspension is 'rear steer', that is, the rack and pinion is mounted to the back of the cross member. The engine can only come so far forward before the oil pan hits the the rack and pinion, so that dictates where the engine goes. Many of the LS engine installs, even those with Mustang II suspension had the engine pushed further back into the firewall anyway. I'v even seen old valve covers welded into the firewall to clear the V8s cylinder heads. So rather than cobble up the inline six firewall, which looks kind of goofy (my opinion only) with a V8 pushed up against it, it was easier to just make a new one The LS motor has the air intake pointing forward, not up like a SBC, and I see a lot of air cleaner setups that I don't like, so having the engine back gives me more options for an air filter.