I have a 4.300 stroke in my 400 block, I had a 4.250 stroke crank in it before that I had ground the oil pick up boss for .045 clearances. I didn't have to grind any more clearances with the new crank. I use a set of CAT H beam steel rods also. I also use a stock Mopar 3/8 pick up for the 1970-71 street hemi 440-6pak oil pan. IHTH