I think you'll be hapy with it...in my '59-other brnd PU which just had a rubber floor mat, I put n Dynomat, under the seat up to the top on the insde of the fire wall, best as I could get it.
Sure did quiet it down, from engine noises to road noises, plus my foot didn't gte hot anymore when leaning on the trans tunnel.
I'd expect (or want) the same results from accuostishield.