It can take many hours of running to "cook off" the grease residue
that sprayed onto the cat conv, so be patient.
Eventually you'll notice (with a flashlight aimed down from the
passenger side windshield aiming FORWARD under the right
motor side) if you have a FRESH motor oil seepage coating the
old dried grease...and even see it from underneath the motor too
if it's dripping onto the exhaust. THAT would be a right side head
gasket oil leak, for which there is NO recourse (trust me) except to
replace the HGs ($1400-1800 with a good indie wrench).
Oh...but you may get lucky if you notice that any oil leak emanates
from the TOP of the right side of the motor rear, where the stupid
$15 high pressure variable valve solenoid oil pressure switch
cracks and spews oil all over the right side of the motor. But if this
upper area is dry, and you're leaking oil, it' the HG. (Sorry).
So check that oil pressure switch immediately, as it's a 10 minute
fix if leaking. If you can't see an oil leak just drive around normally
to further "cook off" that old DOJ boot's messy grease. Wiping
with a rag and spray-cleaning MAY speed up the process, but be
even smellier in the meantime. Usually it's just better to let it cook
off as there are too many cracks and crevices in those exhhaust
heat shields to try to clean them up thoroughly by hand or stinky
sprays. Hope you dodge a bullet....