if you want 400hp, its not difficult but its not cheap either.. Summit Racing or Jegs have Heads/cam/manifold packages that will get you there.easily......is your motor an L82 or an L48? the L82 has a good bottom end for building power on..
heh i am looking to do the same to my 75 targa top L48 is there a link for what u are getting as i didnt see when i looked there.I just found a kit on summit for 600 bucks that will get me just over 300 HP. I think I'll go with that and see where I can go from there. Thanks for the help!
like I mentioned earlier, its not difficult to get to 400hp, but it aint cheap either.. and if you think you went over budget shooting for 400hp, think where I m at with 525hp! and the drivetrain mods to hold it!... LOL!....that said, the very first time you drop the hammer on it after break-in,and it comes to life, the GRIN ON YOUR FACE WILL BE PRICELESS!!!!!400 HP is not going to be cheap at all. I started with an older rebuilt 350 in my 1980. The rebuilt turned out to actually had a 4 bolt main block and I stayed with it. My original plan was to find a 1986 or 87 block that was machined from the factory for a mechanical fuel pump. The machine shop actually had a couple of blocks available. The 86 block is already setup for a roller cam which could save some money vs a retro-cam.
I went with a 383 eagle crank, eagle rods, SRP pistons, CompCam roller, Cloyes timing set and Brodix heads. The block was line honed, decked, etc.. There is a long list of parts required and I am already way over my original budget (way over)!