Et, Milage, and driveablity will all be determined by factors other then the cubic inches. A mild 383 shouldn't require allot more fuel then a stock motor.
Lingenfelter makes a 383 that is 49 state leagal, makes about 430-450 HP and runs on 28Lb injectors.
If you build a big HP engine with a radical cam regadless if it's a 350 or 383
the milage and drivablity become an issue.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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