I originally had a 65 383 block with 516 closed chambered heads in my car. Traded it up for a 69 HP 383 and you guys know what I did. Diamond pistons (forged) were big bucks, hydraulic roller cam, new rocker arm shafts, file fit rings, forged crank, extensive port work to 906 heads, totally blueprinted etc etc. I am running a four speed with the 3.91 gears too so that helps. I was told if I really wanted to wake up the motor to go aluminum intake and aftermarket carb. I was worried about the air grabber fitting with these, and I really realllly love the fact that when you look at my engine it looks bone stock!! It was a lot of money, but it will be a lot of fun suprising people with my 383.