I'd pull all steering linkage but leave the box in.
I'd test fit from underneath without the motor plate (and K frame).
I have no idea where you got a front sump. Trucks use rear sump, cars use mid sump.
I'd also be prepared for clutch linkage issues and have a mini starter already fitted to the engine before install.
Take a look at bigblockdart.com for more info.
I don't know if a BB/scattershield/4 speed and headers will require very specific parts, but they would know the best combos.

I'd also have a grinder, torch and big hammer close by!