Budget build goes like this.Cast 72-78 440 pistons .030-040-060 over.About -.020 deck height.New rod bolts/resize.Balance to taste.If you use the steel 383 crank rebalance is mandatory.Low end torque?, go with the 60302-3 Lunati Voodoo.Dual plane not single plane intake.I prefer 915's to 906's and either to the 516's.If you prefer the 516 use the 1.74 exh valve not 1.81.2.14 int valve is fine in any of the heads.