My combo of > GT40Y heads, Cobra I/T, lower cleaned up, 65mm tb, svo1.6rr, 1 5/8 shorties,2 1/2 bbk catted h & flows,pullies, efan, with this set up made 270rwhp/305rwtrq, can I squeeze another 10rwhp out of this set up by going to 1.7rr, the heads are low mile heads. any other suggestions would...