I recently bought a 383 (69 335 HP) 727 auto swapped 68 Valiant so you know where I stand. It already had the Shumacher shorty Tri-Y headers on it easy plug access. I have an aluminum intake, water pump and housing awaiting paint and installation sitting on the floor in the living room. Battery is already in the trunk. I chose the big block because I had never owned a big block before, I was looking for that low end torque. My current dilemma is whether to change out the lumpy cam in the car with a high lift short duration cam that would match the gearing or change the 2.9 rear end for something that matches the existing cam. Fear of bad lifters is a factor.