Problems with small block/400 auto trans vs original staight six setup?

[sstchester]

All,
I'm getting ready to install a small block 350 with a 400 transmission in the bay of my 66 pickup.

Can anyone give advice on problems I will have? I really don't see an issue other than the current frame transmission supports, do I use those or some other style/year brackets?

Other problem I see is the linkage from transmission to firewall column, not sure on the correct setup.

Last question: I have a steering column for a three speed. Will this column shifter work for a 400 automatic transmission?

Any help would be greatly appreciated.