The reason 4.3's are not as swapped as you would think, is due to the cost. For the same cost, a SB can be installed. The 4.3 requires all the same mods and adaptors as the SB. Soooo, why be small when real power can be had for the same cost. I too like the 4.3, especially when drivetrain life will be longer. Actually, the 4.0 is a better torque motor, cheaper to install, and, kinda original equipment. So if a 6 is in the future, 4.0 is usually used.