I have a 440 in my challenger, i don't race it anymore, just cruise with the kid. I have a 440 with 11-1 compression, .505in .505 exh 290 duration isky solid lifter cam, 1.5.1 roller rockers, 452 heads with 2.14 and 1.81 stainless valves, bowl ported and other port work and a three angle valve grind. An m1 single plane intake and 850 holley with a proform hp center body. My question is will I gain anything with a set of eddy or 440 source heads. I don't want to increase my cam or carb because I like the drivabilty of the componation. Thanks.