I agree the small carb is giving up power; but as a streeter; ask yourself when is the power lost and does it matter.
With 3.91s and a TF trans, you are gonna be, or should be, spinning the tires right thru first gear anyway, probably with half as much carb. That puts you at say 6000= 48mph in first. Going to 3700 in second. Now, 60mph will be about 4650rpm,not even getting on the power curve of that big cam.
Ok so now with a 60mph limit and 3.91s, you could probably give up 2 cam sizes and not be much slower; just have a lil less tirespin......... because the smaller cam will power peak closer to60mph than the 292, and very possibly have more power at lower rpms, so the average power delivered in second gear, up to 60mph, could easily be the same.
As a real world comparison; I switched from that 292/292/108 to a 270/276/110 and never missed that big cam; that's 3 cam sizes by advertised/3.5 by the .050s. Well; I did miss the idle-lope,lol. And yes I'm sure the 292 would have been quicker in a drag race to 110mph. 3 years later when that 270 died, I moved up to a 276/286/110, and sorely missed the 270. It took a lot of work and a lower first gear to be finally happy with the 276 cam. A 750DP, and 3.55s were constants, and the cylinder pressure was adjusted to be nearly so.And in the meantime, I saved thousands of dollars in fuel costs over time. As a DD that 292 was hurting me bad.
So the point is IMO, yes, you are leaving power on the table with the smaller carb, but are you gonna see the difference in zero to 60 times? And if yes, then how much? and finally is it worth it?
To be fair, a 600 is pretty small for over 360 cubes. A DP carb, even if it isn't any quicker, it will sure feel quicker,lol. My 750DP was easy to tune, and will idle down to 550 with the T-slot sync set right, and the timing retarded to 5*. I usually have the idle at 750 by cranking the timing to 14 from 5, and the 367 will take full throttle almost right off idle with a 10.97 starter gear....... cuz the tires spin right away. I only retard it because I have the dial-back computer in the cab, and at 5*/550 rpm it pulls itself at 4mph, around the parking lot, being the slowest it can go with 3.55s.