Magnum heads on LA block H.p increase
The mopar performance magnum stroker I believe was 435hp and rather same cam as the 380hp. With a well tuned chasis and engine I would think low 11's in the quarter would be realistic.
I ran a Mopar Performance hydraulic roller in a stock 5.2 engine in a 3650 pound Dakota long box regular cab . 8.80's in the 1/8 with severe traction problems. Had a mopar computer and hooker super comp's.
Here is a somewhat thread on the cam specs for the 300hp and 380hp and a few other mopar performance cams. The one I was running is in the thread. Just posting to give a ball park idea of what the factory did