Talk about rage bait… Ford folks were aghast at the site of a ’71 Challenger idling into their show. Owner Alex Castillo didn’t blink pulling up in his Mopar.

"I mean, why not?"

That's the first thing Alex Castillo said when we asked him the most obvious question: why shove a Ford Coyote into a 1971 Dodge Challenger? He grinned like a guy who knew this was going to piss off exactly the right people.

Parked among the Blue Oval faithful at Holley's Ford Fest, his Mopar coupe didn't try to hide. It sat proud and idling smoothly, sounding every bit like a Ford, even though it seemed like he didn't go home after the MoParty two weeks prior.

And technically? It belongs here. The only absolute rule at Ford Fest is simple: if it's got a Ford heart, it's in. Doesn't matter if it's a Mazda RX8, a Thunderbird from the junkyard, or, in this case, a Mopar muscle car that sold its soul for a little DOHC efficiency.

Castillo's Challenger wasn't some trailer queen rolled out just for clout. He drove it 19 hours from New Mexico to Bowling Green, Kentucky. "It drove great," he said casually, like that's a normal thing to do in a one-of-one drivetrain mashup with parts from three different Fords.

Alex isn't new to builds. His YouTube channel, A&A Mustangs, documents many classic Ford projects—mostly early Mustangs, as the name suggests. But this was a step outside the usual.

"Yeah, it's still a Ford drivetrain, so I figured I'd bring it to Ford Fest," he said. "I did all the work myself."

The story starts with a family connection. "It used to belong to my father-in-law," said Alex. "We'd visit Georgia since 2009, and I'd always see it parked. It was just sitting there." A deal was finally struck last year, and Alex hauled the E-body back to New Mexico. But instead of the typical HEMI resurrection, he went left. Way left.

"Everyone does a HEMI in these. I'm a Ford guy. I'd always wanted to do a Coyote swap, and this was the perfect candidate."

THE BUILD

The result is cleaner than it has any right to be. Under the hood is a Gen 2 Coyote out of a 2014 Mustang GT Performance Pack car. It's backed by a 4R70W automatic from a 2004 Mustang, and the rear is a Ford 8.8 from a '98 Explorer, complete with 3.73 gears and disc brakes.

Swapping an Explorer 8.8 into a Mopar might sound sketchy, but Alex did his homework. "The pumpkin's offset to the passenger side in the Challenger—and same thing with the Explorer axle—so it actually lined up perfectly."

Even the oil pan stayed stock. A Mustang rack-and-pinion takes care of steering, and there's even a Volvo electric steering pump mounted to the fender to keep things clean and belt-free.

Up front, the only drive accessory is an alternator from a V6 Mustang. "The V6 alternator sits farther back because of the pulley style. I just moved the tabs to fit, and now I can use a factory belt in case I break one."

Electronics are handled by Holley's Terminator X Max system, managing both the engine and transmission. "Huge thanks to Holley," Alex said. "I'd never used the Terminator before, but it was awesome. The thing shifts great."