Oil pan clearance

Rookie mistake. I just finished putting together the short block of my 512(440) build when I ran across the @AndyF pics of oil pans and clearance for idler arms. My oil pan does not have the notch and is a 6-7 quart deep pan The engine is on a run stand right now. Today we will do a trial fit to see if I have clearance at all. We are also changing to manual steering. Do we need to install the manual gear and connect the steering up to check clearances? This is in a 73 scamp. Any chance that this pan will work or is it a must to have a clearance for the idler arm. Thanks for any help.