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I am biulding a 350 for my 56 chev . Edelbrock 650 carb, air gap intake and Alum RPM heads with a 9.5 to 1 comp ratio. It is a 4 speed stick and 3:73 rear axle. The car has power disk brakes so I need vacum. What should I look for in specs. for a good cam
 

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To be completely honest, you will be better served to call Comp Cams and give them all the info.. They can calculate what is opimum for that setup.
Not dodging the question, I just think they would be more accurate.
Their number is 1-800-999-0853

Mike
 

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what about a vacuum canister???

A vacuum canister will store enough vacuum for the brakes to work properly.. Check out the 268H comp. cam. I thing it has a 487/490 hydraulic lift, builds good power, has a somewhat lopey idle, but is very streetable. I had one in a 10-1 compression 355 with worked over 462 casting double hump heads and a single plane intake and a 750 holley. The 68 Camaro it was in was driven almost daily and built plenty of power and had a real good sound for a mild build.
 

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Get a cam with 218-220 duration on the intake (@0.050") and 220-230 on the exhaust. This is enough duration to easily get you 300+ hp. Aim for .460-.480" valve lift for a street car to avoid needing super beefy valve springs.
Try to get one with 110 lobe separation angle. This will give you a nice lope and you will have plenty of vac to rum power brakes without an ugly canister. And it will still be super streetable with a good dual-plane intake.
This cam should be good from just off idle to 5500+ RPM.

For my street small blocks I will always go for a Hydraulic cam about this size.

If you had a bigger motor (say...383) I would go more aggressive with the duration.

If you had the scratch for a Hydraulic-roller cam I would go for that, and then you could get even crazier on the cam specs and still be super streetable.
I have one in my car ( a 517 Big Block), and I gained 100 horsepower and the car is still very docile on the street. 246 and 256 duration @ 0.050" and .645" lift on both sides with a 112 separation. Car drives to the track, 45 miles away runs 7.50's in the eigth-11.80's equivalent (Can you believe in my area of So Cal we're down to one 8th mile track! Whats the world coming to?)

Hope this helps a little bit,

Joe
 
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