LS1 would be WAY better, I have dreams of a 6.0 LS engine with a tko600 in my Mustang....... I've had 3 F bodies in the past, all z28's, '78,'93, & '95. I like the Mustang car itself way better than the Chevy's thats why I bought one. But the Mustang with the Chevy drivetrain would be the ultimate. Hell, a 6.0 truck motor weighs less than our 4.6's and can put down close 400whp with heads, cam, and exhaust.