Can anyone help tell me what I need to supercharge or turbocharge my 403 Olds/turbo 350 tranny? Which ever one is cheaper I will do that one. Thanks  

vueboy
  turbocharging an engine is'nt cheap! Now, if you really want to build a turbocharged motor, I would'nt use the olds 403. even though It was once said that, it may have been the best engine, overlooked. it did have problems from the start, like, factory two bolt mains. Now if you were to add a supercharger to this application, their would be a lot on stress down low and could cause catastrofic failure and turbo motors are'nt cheap by far.
  I think the best place for you to start is with a good core, and take it from there.