Suspension V6 - V8 Suspension Upgrades?

[1978Cobra2]

Well, I posted a few weeks ago about doing the 302 swap into my II. I found an engine and bought it. Although I still need to get it running and locate a few parts here and there, I am getting close! Anyway, I have the suspension of a v6 now, was there any change from the v6 to v8? I would imagine the springs might would have to be bigger due to more weight, any specifics? Also what suspension upgrades are there for a II that will make it not feel like a tank in the corners? I plan to have this as a cruising car and I would like to take it on some curvy back roads. I'm not much on suspension so any help would be appreciated!
This is unrelated but does any of the bell housings for the C4 have different depths for the torque converter?

Thanks in advance for all information!