Choosing a rear suspension

Hey everybody! Seeking help and advice for a rear suspension set up. Car is a 71 duster, Inboarded springs and narrowed 8 3/4. Engine is a 421; half filled block, 3.5” stroke, 4.380 bore, 14.5-1 compression with b1-bs heads. Plan to run e85 and maybe a single stage of juice. Trans is a th400 with a brake. Car will be a grudge car and see the track only. No street driving. Problem is I can’t decide on a rear suspension set up for this car... I’ve debated on running SS springs but am not sure if I would be overpowering them and if they would hook. I’ve read allot about caltracks and split monos and it seems to be a mixed review on them as far as a- body mopars go. My goal for the car would be to dip into the 9s. Any insight, advice, or help would be greatly appreciated!