Re: How to Convert the Old Line Weights to Modern AFTMA Line Weights;
Rick I think you'll find a #6WF will be Fine,a #5 Rio Grand might even be OK ??
The reason The Early Lines were heavy they became waterlogged.
I remember the HCH or 7 DT Lines very well,from the late 50s,early 60s until The Weight Fowards arrived on the scene as they were all you could buy.
I still have a new HCH Line on a Reel I kept as I was chasing a Hardy's Classic Top of The Range Rod which belonged to a Fishing Mate of my Fathers which I had hoped to purchase & one day use,however now I would probably use a modern DT or even a WF Line instead.