hello

Welcome to FABO Gene! I am a SB A-body & a BB B-body guy and there are many people here who have done the conversion (I have not). With that being said, you can use your /6 k-member with the correct BB transition engine mounts (ex. Schumacher, etc.). I think you may be looking for a specific oil pan to clear suspension components. I believe the pan # is 187 (maybe #182). As far as headers go, check the latest chassis versions from TTI or Dougs or you can go fenderwall. There is always the option of exhaust manifolds but I think you might be looking for original BB A-body pieces (unless there are others that will work). Besides this, I am thinking you will need a BB 727, new/modified driveshaft and am 8 3/4 if the car isn't equipped with one. There are other misc. upgrades to consider (ex. cooling, fuel delivery, suspension/spring/torsion bars, braking, etc.) but hopefully, this will be a start for you. Good luck.