How about the TA 288-94, (230-240) It seems like an excellent choice. It loads the power between 3600 and 5500. Looked at all the dyno sheets I could find. Added up the HP numbers from 3600 to 5500. and divided by 20. The average was surprising. Iron manifolds need the low end torque. More average torque means better times at the track. Good idle too! Ask JW.