Shocks & spring bushing questions

[BTR69]

Good evening. I posted this in the Bracket racing topics last weekend & it doesn't appear to be getting much action. Maybe the Stock racers can shed some light on their opinions with this?

Looking for input regarding options for shocks on a 68 Camaro. Nothing special, currently runs 8.0's in 1/8th mile. Mildly modified small block, powerglide, 4:10 12 bolt rear w multileaf springs. Think it's around 3000#. We may go quicker later in the year, maybe start of next season. Lots of noise in back of car, likely shocks or spring bushings, or both. Sounds kinda like the shocks are trying to beat their way through the floor. Looking to replace front- rear shocks & spring bushings. Any reccomendations are appreciated.

Also, what are the differences/advantages to twin tube vs mono tube shocks and would they make much difference on a slower bracket car like this?

Would there be much advantage or difference in going with Polyurethane bushings over rubber? I've heard from some folks that the Poly can tend to make a bit of noise and make the ride stiffer than some folks like as well.

We do have a 9in ford rear with mono spring setup & cal-tracks & same gear in another Camaro currently just sitting, waiting to be finished, that we're considering swapping, but we haven't made a final decision on that yet.

thanks in advance for your input.