Mopar B-body Rear suspension Help

[G_T]

Okay folks, the mock up has raised another question... I'm feeling "needy" right now

Background: 70 Dodge Charger, Moser 60, Tubbed, "planned" to use Hypercoil leafs.

My problem is I can not get the ride height correct. I need to lower it another 2.5 to 3" in the rear and I don't think I am going to get the leafs to work out. I went as far as to attach the front of the leaf to the lowest ride height whole and rest the back side on the trunk floor - even loaded ~300lbs in the trunk. No dice. See the first pic - the wheel well lip needs to come down to the top of the Forgeline Wheel lip. Obviously 3" lower blocks ain't gonna work. My clever daughter said "Dad why don't you just flip the leafs upside down so they bow up and not down?"

I am looking for suggestions on what to do next. I have *zero* issue modifying the suspension/floors/etc. I think I need to go to a 3 or 4 link system with coilovers.

Let me hear your suggestions as well as vendors that offer something to address this need for a 70 Mopar B-body. I'll make everything if I have to...

So, here are my constraints for the rear:

1) Car will be driven on road course/autocross - not targeting drag strip.
2) Work with existing Moser 60
3) Rear sway bar capability - body mount prefered
4) Work with mini-tubs.
5) Nice to have is work with existing leaf relocation kit (moved in 3" to rails).
6) Watts link - or nothing if the triangulated system does not require it. I have what I need to make the watts link.
7) 3" Exhaust
8) Coil-over - not interested in air bags...
9) Retain stock rear seats.
10) Obviously, need to be able to set the ride height 3-4" lower than stock.

I think 2 & 9 eliminate Lateral Dynamics 3-link. I looked at other links on the site and know there are a lot of good choices and preferences. Looking for something to work with the above constraints.