Called up a local parts store and he was telling me about these heads, ( i was asking about there high ports) but these are about $100 cheaper, and out flow the high ports. Can anyone tell me about these heads? the specs he gave me are $1200 out the door this weekend (no tax) 2.02/1.60 valves, CNC ported (1262 gasket?) 197cc intake runner they flow at 303CFM/227 (about 40-50 better than the high ports) double binded springs good for .580 lift part # 1204000180c i know this is ALOT of head for a 306 but the car is supercharged, (around 10 lbs starting off then bumping it to 12-15 lbs this summer) so cramming the heads full of air shouldnt be to much of a problem, so i guess the question im asking is how good are these heads? do they perform well? willing to support over 500rwhp? thanks