Regular production 327s were 2 bolt, but I have heard of a few experimantal 4 bolt 327s and maybe a handfull of race prep blocks that were 4 bolt as well. I will admit, I have never seen one in person. As far as 350s go, all 350s from '67 (Camaro only) to '73/74 are 4 bolt main, regardless of car or truck. The '68/'69 302 (block code DZ) was alo 4 bolt. IIRC, '68 was the only year for large journal 327s.
