I have a heavy fully optioned 94 coupe. We are building a 5.0 from scratch and have most of our parts bought for a fun street combo with a nasty sounding idle :GT-40 upper and lower, E-303 w 1.6 RR's, PIH with A9L computer, all of the regular bolt-ons and a T-5 and 3:73's. We have a #9 powerdyne to add to this combo and are ready to order the alum heads. My question is I want to buy AFR's but am not sure which one I should get. I am using forged pistons with flycuts which will accept the 165's or 185's. I was planing on getting the 165's, but was wondering if you should automatically go to the 185's with a blower or if the 165's are still plenty big for a 306 with #6-#7lbs. of boost. I will probably only be seeing around #6-#7 of boost at the gauge with the powerdyne and shift with the E-303 around 5600-5800 rpm's. With that amount of boost and .498" cam lift, which head do you think I should use for good all around power? I would like to order the heads today, so please tell me what is the best choice.