The engine displacement and power band of said engine could be a factor in the combo youe are adding about. A455 or 400 with mild cams, properly built would handle the load easily. My 77 TA with its 7.6:1 400 engine and its 2.41 rear gear had NO issues cruising at highway speeds. Going to a 2.1 actual gear with a more powerful engine, should be fine.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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