Estimated horsepower?

yup. Stock bottom...For now!:D

Yeah I see the edit about the 331.

Personally... I would go with bigger injectors, bigger intake, more cam for the 331, the extra cubes will like it :nice:

My 331 had 42 lb injectors, TFS R intake, AFM N91 cam, TFS 205 CNC heads, 1.75" long tubes....

went 11.29 @ 123 in my LX (pump gas, full interior, drag radial, idle launch street car)
 
dang...Thats real fast! Thats what I'm talkin about. I wonder if my world class t5 will hold up to that much power? haha. My winter project this year is built rear with auburn diff, and 31 splines along with 5 lug conversion and suspension.