[John V.]

I'll try to help with the Battery Cable questions.

I suspect the reason for all the p/n changes is connected to the fact that Delco introduced the Side Terminal Battery in 1969 but only for the aftermarket at first.

I remember this advance being much ballyhooed at the time since the side terminal design was going to be a sealed terminal and resist corrosion. Not sure if that proved to be the case.

For '71, GM was to install the new side terminal battery, according to this article, in 80% of production for '71.

Note, the Pontiac 455 GP and other 455 applications were also planned to get the new "maintenance free" Delco battery also featuring the new side terminal design.

https://www.automotive-fleet.com/147...es-for-gms-71s

I'm guessing that the side terminal battery quickly became the service battery of choice and the Side Terminal Battery Cable p/ns soon superseded the original Post Terminal (Spring Ring Type) Battery Cable p/ns.

I couldn't find a listing at GMPartsWiki for it, but I'm just guessing that p/n 8907535 p/ns was a Side Terminal style Cable. If you remember how these worked, they were a "bolt on" style. The bolt screwed into battery itself, no separate nut used. The bolt was captured within the cable end itself.

I'm not sure what style the 6289160 and 6296738 cables might be.

A listing from 1981 shows 6296738 discontinued, use 8909815. A '79 Chevy Truck MPC listing shows this as 43" center to center of the holes. Looks to be a more or less generic service replacement for early '60s trucks as the GROUND Cable with Terminal.

A search at GMPartsWiki shows that a ton of 297xxxx and 298xxxx p/ns were discontinued circa '73-'74 along with a ton of 628xxxx and 629xxxx p/ns at the same time.

I did not find 6289160 or 6296738 in that list of supersedures.

A 1970 or maybe 1971 MPC might list the OE Battery Cable p/ns for your '70.

If you can find the OE p/ns you might have some luck speaking to Lectric Limited. They apparently have original engineering drawings and can duplicate the wires/cables from them.

I spoke to them when I was chasing down the dual horn wire for my '64 GTO. As I recall, there was a revision that changed the length of the wire during production and I could decide how long I wanted them to make it (early or late length).

If you can find the p/ns they may be able to pull up the drawing and see what it shows and whether they can duplicate it.