700HP 383 Buildup

gforce said

will drivability suffer with the 600+ lift roller cam?

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That depends on what you consider driveable LOL If it's an automatic you'll need a High stall converter, then you got that to deal with as well, along with high compression pistons and finding gas.
What do you want this for? A secondary car that maybe just squeaks out on the street on a Friday night and goes to the track regularly, or something you drive back and forth to work, and/or school every day rain or shine, but ya want it to have some muscle?
You really have to pick and choose your parts carefully.
There's a certain point when building up a radical motor where it becomes a real pain to drive around all the time. You'll enjoy the car alot more if you build the motor for what it's mainly going to be used for. Do you really want to add octane booster EVERY TIME you fill up your big block(gas guzzling) car?
Just something to think about.
What kind of car is your 383 going into? Mines in a 70 Duster until I build a 500ci stroker for it.