Ok man. First if you are going to use your 305 motor then start at the bottom and work your way up. Start with a Rod and Main bearings, and then get the Hypereutecic pistons they are better than cast and not as high as the forged ones. Then call comp cams do some research they will help you get the right cam. Then your heads well you could port and polish them and have the valves cut back and they still wouldn''t be as good as a set of stock vortec heads you can pick them up for a couple hundred bucks, they come stock on chevy 350 motors from 96-99 and they are 64cc. your intake will work ditch the carb. and get a holley,lot easier to work on and cheaper. if you can a MSD ready to run distributor would be nice. oh yeah dont over do the carb bigger is not always better. I hope i have helped.