Suspension confusion.

[economiser]

Yes, I'm reading the stickies. Lots to absorb.
Hello,
I'm transforming a 71,477-mile garage refugee into a road warrior, just not high powered nor ugly.
I'm here because I need to create a new rear suspension for it, and I've chosen an offset 3 link with Watt's link.
It's also getting the front suspension / steering / brakes from an '87 RX-7, which is very different, supposedly bolt-in, and seems to need some welding and sectioning for the correct position, but my concern here is fore-aft tilt / anti-dive.
The car is at the paint shop right now.