Magnum heads convert to sbc rockers?

Here are a couple of picsof my heads. I used push rod Guide plates which aren't on the mock up pics. It's been 2 years now with no problems. I don't really push the motor that hard, it runs nice. They are slightly noisy, I've heard it described " sewing machine sound".

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Did you get them to quiet down ??
Anyone reading this have a similar issue ?