The idler is for a 1968-72 which the car is a 1972 and the pan is one of the stock pans with the notch in it that everyone sells in the for sale section for use with an A-body big block swap..cant remember the 3 digit number but i 'think' they were C-body pans?
Per my link above, the factory big blocks used different idler/pitman arms, which I've only reliably found through FirmFeel. Check the factory part books. Different numbers.
