i have a 420a motor, i plan to do small 8lb turbo in the near future but i need to rebuild the engine first. so where can i get a stock bottom end rebuild kit? ive seen some on ebay but ive never heard bad nor good things bout them. can anyone help me. shes running on 275k miles and before i start throwing money at her for mods i need to get the engine rebuilt. oh and on a second note, bout how much would a machine shop cost for a ported nd polished head?