The best bang for your buck improvement on that drivetrain is to replace the Powerglide with a TH350 transmission. A direct bolt in upgrade.
I like Chevelle 4 drs...
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2017 Camaro RS -217 cu in 365 HP w/8 speed auto
1967 Camaro SS -5.3L LS w/4L60E & 4.11 12 bolt
2019 Cadillac XT5 3.6L V6 w/310 HP & 8 speed AWD
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