Doesn't the reciprocating assembly in an FE weigh about as much as a complete SBC?
It will be fine with aluminum just slightly more throttle input when pulling off from a stop.
Make sure you get a good flywheel if you go with aluminum. I've been in some cars with cheapo budget alum flywheels and they would flex with RPM. (You could push the clutch to the floor while in gear and if you revved it over 6000rpm the car would lunge forward). Bolt the same clutch to a good flywheel (or steel) and the problem disappeared.
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69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
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Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
That's what an aluminum flywheel was made for..
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