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Once you change those tubes you are committed. Now that you have the sludge out, do this. Next time you change the oil (which hopefully is often) put 1/2 quart of plane jane ATF in the crankcase, and let the engine run un no load for 20 minutes.
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I hope you mean add the ATF to a regular oil fill and not just run the engine on 1/2 QT of fluid ...
Listen, those tubes are there for a reason(s). If they flow properly leave them alone unless building a HP version. Ain't no 312 S/C engine we are dealing with here.
If you decide to go full suicidal and flush an old engine like this, expect the oil pump pickup screen to become fouled. All you have to worry about is the inside of the shafts being clean and no damage(s) to the outer surface of the shafts and rocker arms with proper oil pressure.
The proper oil will clean the engine over time.