lackof power @ wot

I have a mild 350 with an eldelbrok 7102 intake & matching cam,a stock fuel pump & a holley 4160 600cfm carb w/ factory HEI. On wot at about 3000 rpm I lossing power, almost like the truck is being held back as I start ezing out of the tolltle the engine startes picking up and takes off. A friend told me that the carb was to small, that i needed a 670cfm. He said it was starving and by ezing up on the tottle it aloud the fuel to catchup. I asked him if it could be the cheap fuel pump and he said no, a macanical feul pump will do just as good a nice holley or what ever. My friend is a mechanic and us to race mud buggys, so I think he knows what he is talking about. But a nother friend said the 600cfm was proberly to big? Any sugestion other then keeping my foot out of it. Thanks Steve Roy

Could be undercarburrated,,,,then again taking your foot out of the throttle slightly,will increase vaccume build up and therefore making your engine run a little better,,,you might want to try an air restrictor plate to keep your vaccume up before you try a different carb though.
It would be interesting to see what a vaccume gauge would read on this car at 3000rpm

All them things. Also check to see if it is running out of gas due to Fuel restriction, floats set too low, not enough fuel pressure. Sounds more like that is your problem rather than the carb being too small. Carb may be partially stopped up also.
Ed