SBC to BBC Front Suspension

[70-Chevy]

I've read about 20 past posts on this subject, but get conflicting information, so I'm gonna ask again! Sorry for resurfacing this subject.

I have a 70 c-10 that had a small block in it. I put a 3/5 drop on it with new springs about 5 years ago (so the springs are relatively new). I am now going to a 496BBC and also I'm putting a Willwod disc brake kit on it with 2" drop spindles. Technically, the drop will now be a 5/5 going forward.

I want a slight rake to the truck, but not a lot.

Questions:
1) Do you think I should swap the front springs to a 2" drop BBC spring?
Or, can I leave it alone and expect a good ride with it with the SBC springs?

2) What do you think the rake will be with a 5/5 drop? Just curious how much I will need to bring the rear down.

As always with you guys, thanks in advance.