I need to decide wether to run a 700R4 or an M6. The 700R4 is built to handle 500HP. All I have is the trans. The M6 needs a mild rebuild (400.00-total). I do have a PRO 5.0 Shifter for the 6speed however all I have is the trans. The S10 is an automatic but, I have done coversions in the past. Thanks for the advice/educated opinions/etc... in advance.