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Originally Posted by Excaliber
Hmmm, what is a 'stock cam'? For the 360 truck application that would be a cam that makes a lot of TORQUE at a low rpm. I would guess a stock 360 cam makes it's power in the 1500 to 3000 range and at 4000 to 4500 it's 'done'. This could be a bad match between cam and intake.
Solid or hydraulic lifters?
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I agree with Excaliber. I had a similar situation on a 351w I had. It was a stock rebuild except for a bump up in compression to 9.5:1, minor bowl work and valve job on the heads, and a 600 cfm holley 4bbl. I switched from the stock cast iron 4bbl to a Victor jr. thinking that I would gain power. It was a dog. I honestly think I lost power. I then switched to a Performer manifold (not the RPM, just the regular Performer) and it was a whole different engine. It would pull real nice all the way to about 4500 rpm, and had great throttle response. I think your 600 cfm carb is a great choice for your 360, but I would consider switching to a Performer or some other dual plane intake. Small cams, stock heads (or mostly stock) and big single plane intakes don't usually mix very well.