64 - C10 - LS swap questions

[GMC-YA68]

Doing a swap on a 1964 2wd C10 shortie. I have been searching but seem to be striking out on some key questions, and/or the build threads in the FAQ are outdated and one would think there are more swappers out there now.
I'm doing a 4.8 / 4L60E.


1) Will TBSS manifolds fit with Dirty Dingo Double D plates? I'd like to steer away from Doug Thorleys on this one (only because I am trying to keep to a budget)

2) Heard the stock truck pan sits too low. This will be a lowered truck. Is a f-body pan the best and cheapest solution?

3) Will the tranny clear my hump?

Thanks guys.