1965 Chevelle 300 (2-Door Station Wagon). A very light car at #3304 lbs. and with an automatic.
The 'basic'................283/220 HP engine with the 2-Speed Powerglide got you into..........H/SA in 1965......(15.00 - 15.69 Wt/Hp)
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The 'performance'....327/250 HP engine with the 2-Speed Powerglide got you into..........F/SA in 1965.....(12.50 - 13.99 Wt/Hp)
In 1968, these cars were highly desired, as they fit 'nicely' into K/SA (13.00 - 13.99 Wt/Hp).
I do remember this combination in a car called "Mr. Magoo".
Ran 14.40's in 1968/1969 and eventually got down to 14.10's, and won a bunch of Class Trophies in (1968 K/SA), (1969 L/SA) and (1970/1971 M/SA)
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The 'high performance'....327/300 HP engine with the 4-speed got you into.......................C/S in 1965........(10.60 - 11.29 Wt/Hp)
Not a desirable combination for 1968, as it put you on the wrong end of F/Stock (10.50 - 10.99 Wt/Hp).
But a nice 'Street Sleeper' with a Hurst-shifted 4-Speed, 4.10 Gears, and good free-flowing exhaust system with Cherry Bombs.