Thanks Curtis. According to calculation, I am in real good shape. The %'s are [email protected] lift with in.74 and exh.60cfm. and taper to 70.7%@.600 lift with 294.6in.and 208.5 ex. and 70.5% @ .700 with 300.3 in. and 212 exh. Not bad at all for sbf. heads. This little motor should have some pretty big intentions when it's all done.