Big Block Tunnel Ram 660s Questions

I’ll admit I have zero experience with the 660’s. Are power valves an option? I was able to get rid of a tip in stumble on mine by getting the power valve circuit to open sooner. I’m sure the carb guru’s will have something to say. I’ll be watching this thread for sure!
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I can swap the from metering blocks for ones with power valves. I also could add rear blocks to have replaceable jets in the back. I have not done either. These historically run very rich, but these don't seem to do that. I question if the secondary plates aren't sealing. The adjusting screw for the secondaries is not holding them open