Melling replacement 3/4" wide sets are readily available. They will have cast iron gears, not steel. The last set I bought still had a USA made Morse chain.
All timing chains stretch, fact of life with those parts. Double roller sets do not offer constant tooth contact nor are they a "smooth" drive design. Taunted as "high performance" parts nothing could be further from the truth. Most of the "low" end sets aren't that great and even the upper end sets aren't as strong as the Morse type.
The good news is that few of these vehicles are used for daily transporation nor will they see very many miles put on them so you'll probably be fine with whatever you end up using........
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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