The 113's are good stock heads. About 20 or so cfm less flow than Vortecs from what Ive seen. 58cc chambers will up your compression a bit, and the small intake runner is great for torque. Up high though theyll suffer, so any cam with much over .500" lift and 240* duration @.050 will be pretty much useless and just take away the streetability.
Edit: Oh and this is NOT a sales pitch either.
