I have a 57 312 in my 55 f100 it is a front sump. I stretched my front axel 3 inches and have a mono springs on the front and the axle still hits the oil pan. I have read on other sites that the 312 engines were all rear sump. Is this true ?  because I am in need of a rear sump oil pan due to my clearence issues. any sugestions ?

Thanks,