trailing arms vs 4 link rear

[a1953mdl]

I have a 67 short wide I am making a drag truck out of.
It has a 500 cad engine with a 400 trans.
Currently the frame has been cut off about mid kick up, but the trailing arms are still attached.
I am planning on getting the cad to between 6-700 hp. This will be a race only truck. I will run slicks or drag radials. I plan on installing a full cage plus what else will need to be done to stiffen up the frame.

Okay, will the stock trailing arms and coil over work best for this or should I go ahead and install a 4 link? I have to back half this truck anyway.

Lee