Welcome to the forum
I agree. The trailing arm with coils is hard to beat for a lot of different uses. There are a few forum members running some respectable times with the trailing arms.
As for your question on the parallel 4 bar, is it a true 4 link, with adjustable front mounting points, or is it a 4 bar, with fixed front mounts. As long as you have a good pandard bar, or other centering link, you will be fine.
If you haven't already, check out the 'Racing and High Performance' section here on the forum.