this is what im tryin to do guys i have a 2 bolt main 350 fresh bored over .30 8:5:1 comp im lookin to reach 400-425 HP wit this combo
Head: Dart pro1 alum 200/64
Cam is up in the air
Gears 3:73
2800 stall an stage 1 shift kit
limited slip rear
RPM edle intake  

compression seems a little low,what kind of piton u running? flat top piston with a 64 cc chamber should be in the 9-10:1 range.cam choice is up to you? hydraulic roller would be best if you can afford it.duration at .050" should be in the 230-240 degree range,that way it'll compliment your intake and heads.sounds like a fun combo,good luck with it  

How many horses would this have im going wit a reg.cam not a roller  

More than a few Clydesdales...  

i would hope so as much money the head cost but is there a number out there to put with this combo  

You need to take advantage of the fact that you can easily run a full ratio higher compression with aluminum heads. SO you aren't taking anywhere the advantage you could and should.

To get into the 400 horse range you need a pretty good cam, something on the order of Comp XE268.

The heads you selected have too much port volume unless this engine is going to live above 5000 RPM. Otherwise this is going to have a pretty doggy bottom end what with the low compression and the needed long winded cam. You got to get the compression up around 9.5 or higher, with your gears and stall, compression can be pushed to 10 or 10.2 with 92 octane pump gas. This will go a long ways toward restoring the lost bottom end inherent with your parts selection.

Bogie  

I put some numbers in an engine calculator program that I have, and if you run with the 8.5:1 compression with your heads, a Crane energizer 302 race cam (302 adv duration, .500" lift and 106 degrees overlap) with a dual plane intake manifold, high flow dual exhaust with headers and a 700 cfm carb, you would be pushing about 420 horse at 6500 rpm at the flywheel, and 366 ft lbs torque at 5000 rpm. I would suggest putting in some 10:1 pistons (Speed pro makes some nice cast aluminum ones same as i have in my motor that are very affordable) and you would boost your engine horsepower to almost 500 with 438 ft lbs of torque in the same rpm curve. I would suggest about a 3000 - 3200 stall converter though. It is much better suited to the cam i suggested. If you do not want that radical a selection, i can plug in a milder cam and torque converter.

-James  

What are you wanting out of this motor anyway? street driveability or race? what kind of car is it in?  

the motor is in a 1980 olds cutlass i want a nice street power but also where i can go out of town here an there not jus show a lil more go than anything  

It's not the static compression ratio you're concerned about so much as the dynamic compression. That is entirely linked to the type of cam you use and the static CR. Low static CR needs a short cam in order to build compression pressure. The reverse is true with a big cam with long duration. The late intake valve closing (due to the longer duration) bleeds off compression pressure so higher static CR can be used to help build low rpm torque.
There a articles available to help decide cam timing versus CR.
With large cylinder heads like the Dart Pro 1, you'll need rpm to promote cylinder filling. This in turn points to a cam suited to higher rpm as well. Get the compression ratio to suit the can and heads and 425 hp is attainable. Just hope the bottom end stays together.