Let's talk 318/349/390 strokers.
a 4 inch crank will fit the bottom end of a sbm with no mods...
it is your choice of rods that mades the difference....
scat i beam or eagle i beams require no grinding....
a h beam or stock rod will require MINOR grinding for the rod bolt to clear the bottom of the cylinder wall...
if you are buying new rods ....buy the scat 4340 I beam rods..
oil pans clear.....and pickup clear ...