Chassis Stiffening - which kit? Cage?, Stiffening before paint, need help. Options

[corpselaurel]

I have been reading and searching. So far I have eliminated the boxed trailing arms.
I want to stiffen the car up before I paint. What 'kit(s)' should I install?

I have read read that most of the pieces in the chassis stiffening kit are useless. Should I buy the kit and install the others?

I have also read that engman's kit helps a lot. And I was also considering the Inner Rocker Panel Frame Stiffeners.

I just don't know which combination I should install. Should I use all of them or do some cancel each other out (for lack of better wording). Post links to suppliers if you mention any.

I am open to the idea of putting a cage in but it has to be in kit form. Does anyone sell one and would I still need any of the stiffening mentioned above with a cage?

The car is not badly rusted except for the battery tray and underneath - completly gone. I will be repairing it. My plans for the car are daily driver with some autox. Next year I will swap in a more powerfull engine. Thanks for any help.

[Jeroen]

I am still new to the 914 world but I have read about a few guys running over 400 front and 300 back spring rates

Those are no compromise race cars that run on smooth surface tracks.
On rougher surfaces (like street and AX venues), such high spring rates will make the car bounce and skitter and you'll loose traction/grip instead of gaining it

cheers,

Jeroen