In previous threads Cliff has posted that he used the Melling link belt set.
But, he also mentioned that in recent years the chain was chained & may not be as good as they use to be. IIRC, he said the Morse brand chain is the best one.
The Melling number is 3-350S. Price looks to be around $40 plus tax, from several vendors.
https://www.ebay.com/p/75561005
"...Engine Timing SetKIT 3-350S includes:
Engine Timing Chain - Part 350 - Quantity 1
Engine Timing Camshaft Sprocket - Part S305 - Quantity 1
Engine Timing Crankshaft Sprocket - Part S371 - Quantity 1..."
I always used the stock replacement TRW set. IIRC, the chain number was either C350 or TC350. Kept chains in stock, back then.
In recent years, I've bought the Cloyes C3007K stock replacement set. They're really cheap. Probably made in Mexico or China. MAY be the exact same parts that are in the stock Melling set. Don't know.
Best price I can find right now is $20.79 + tax, shipped, at Amazon. The pic is not correct. It actually looks like the pic of the Melling set. Has long slots in the cam gear, rather than round holes.(Unless they have changed since I bought a set less than 2 years ago)
https://www.amazon.com/Cloyes-C3007K.../dp/B000C0AJKY
Summit shows $22. Their pic is not of a Pontiac set.
https://www.summitracing.com/parts/clo-c-3007k
O'reilly & Advance Auto are showing $26 + tax.