I have also heard from guys running 4-speeds that they cant get the radial slicks to work good with 4-speeds. And I have heard that from alot of 4-speed drivers as they run Bias.
As for me I love the 30 x 9 radial slicks I run on my 63 but of course its an automatic. They work good for me with the auto. To bad they wont work good with stick cars. Ron