I own one of those "C" code E-body's, my 1970 Dodge Challenger was and is powered by the venerable SL6. Go-Mango, black SE interior(no upper console), exterior trimmed in SE trim(no vinyl top). I also found, as it is ..an LA built car, it is a first day of production assembled car Monday 8-18-1969, #113. Since I've owned it 44 years (1973), I believe I'll leave it a 6. When I show it, it gets a lot of questions of interest. I've up-graded the engine to a Super-Six version. I love that damned Dodge just the way she is. Thanks, Al