Dan, not sure which Powermaster but it cost $200 12 yrs ago. It worked great on my 400 w 12/13 initial degrees and works fine on my 467 w timing locked out at 37 degrees (constantly 37, w no advance at all). Hopefully the weights and springs helped to return timing back to initial, most agree heavy stock springs and weights work best.
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Chris D
69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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