This is my 1984 hurst olds, it is pretty much all factory for now, but I have a edelbrock headed 10.5:1 461 olds ready to go in,however I am waiting on professional products to get around to making more of their crosswind 455 intake, they are currently "on back order untill further notice"( do you belive that!?! I mean this intake came out like a year ago, and you still cant even buy it yet!)! But anyway, for now my cutlass has the 307 H.O. with headers, intake, carb, and the engine computer removed(changed to "old school" HEI).  It has run a best 1/4 mile of 15.71 and is fairly consistent.