Straight pattern on my 350's with 168 flexplate all the time.The starter and flex plate depends on how the block is drilled for the starter mounting. Pretty sure a 153 tooth fits with straight across holes in block. The 168 tooth uses the the diagonal or staggered bolt holes. I used a mini starter for the room near the exhaust. Also, I think the 194 six I had used the 153 tooth flexplate.