Welcome aboard Felix. sounding like a mild daily driver? TCI rebuild kit I am assuming. I would suggest some Stealth aluminum heads as opposed to sinking money into antiquated 906 iron heads. more details: what vehicle, what application, budget. do you already have the 383? better would be a 400 block with an offset ground 440 crank for 470 cubes & the external dimentions would be the same for fitment