an easy way to tell the difference between the 305 and 350 is if you look at the push rods the 305 have 6 inch push rods and the 350 have 8 inch push rods if i remember right all i know is the 305 push rods are shorter than 350 push rods
This would be complete BS... There's no way in he!! there is a 2 INCH difference in a SBC pushrod.
Nick