>...should i wait till motor out..
Sure. But, you can do it with the motor in the car too. My friend bought a 4x4 lumber piece and cut the ends off to _just_ fit and rest on the fenders of the engine compartment. Using the cut-off pieces for a wider support.
I am doing mine with an engine hoist. Yeah, its more of a pain to have those legs under there.
Either way.
p.s. Check out my "current" (getting closer) K-member install photos off my homepage.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page