Help with cal-trac set up

[Elan Imseis]

Hi all, would like to get opinions on the best way to set up cal-trac bars on my 68 Camaro to get the best possible short times.

Car goes hi 11's with a best of 11.63.

Typical 60 foot times are 1.65 to 1.68 - I'm quite sure I should be able to do much better.

Should I be using top hole or bottom hole? Should I pre-load either side?

Any thoughts would be appreciated!!