Yes, you can use them and they will fit if it states it's for your size 389/400. Problem is with the Chrome ones that I have seen they are pretty cheap and the edges that contact the block are not straight. The ones I have seen are made in China or somewhere else overseas. I would go with an old original in good shape or go to the aftermarket shops....
Brad
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1244HP Pump Gas Dyno @ 11psi (32PSI MAX)
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