HELP need some basic 306 combos!!!!

Keeping the comp ratio 9.5:1-10:1 is about right. Go with a 70mm TB, 75/76mm MAS, keep the stock 19 lb injectors until you reach 350-370 hp. 24's would be too big at this point. The rockers can be the bolt on type and a 1.6 or 1.7 if you check the piston to valve clearance first, no matter what cam you get. I'd advise the E303 for a good overall choice. A custom cam would be good as well, as long as you keep in mind what you'll be using the engine for. The computer would after all these mods do really well with a custom tune done. Have those heads ported and the lower intake gasket matched.