The only way you will really know for sure is to put it all together and take her to a dyno, really, its going to vary, wild guesstimate, anywhere from 50-80 or so, lol, too many variables, depends on how well the porting is done, how well the heads are done and what kind of cam grind is done. Does that help?
Rick Kilpatrick, AAS Automotive Systems Tech, Alamance Community College, Class of 99. 06 5 speed manual Mustang with Pony pkg : GT Mac Mufflers, true duals with one custom pipe. 2.5" system. GT bumper cover, all installed March 7&8 2006. AFE Stage 1 CAI, Motoblue Underdrive pulley, GT aluminum shifter knob, honeycomb rear blackout panel,and dash kit installed. Roush hood scoop and side window louvers installed. SS taillight trim has been installed, new alum. GT steering wheel installed.