still complexed about what to do...1940 chevy 1/2 ton mid 50s 6cyl. ( I think)Is there an ADAPTER PLATE TO MATCH A 400 AUTOMATIC TO THIS MOTOR..AND IF SO WHAT GEAR RATIO WOULD WORD BEST FOR EVERY DAY USE..TOWN AND HWY DRIVING..IF THE PLATE IS MADE WHO AND APPROX. HOW MUCH...