Keep in mind that many later ‘60s and early ‘70s Le Mans and Tempest of similar weight to the ‘61 big Pontiacs came equipped with a 2-barrel 350 coupled with a TH350 and 2.78 rear.
I had a ‘70 Tempest equipped as such with factory A/C and it got out of its own way no problem.
The TH350 should work fine with the 2.87 rear gear.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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