Have dropped the oil pan on my 53 chevy 3100 to adjust rod bearings. After about 2 hours and many tries and cuss words I cannot get the rear of the pan to go on after I seat the front part of it up under the front mount. It feels as though I am hitting the oil intake screen assembly. Do I need to raise the front of the motor up and remove the front motor mount to get clearance to install the oil pan?