Loss of power and engine runs rough... Help???

[bigB98]

So I have a new built sbc 350 engine with maybe 700 miles. I was driven by one day when I noticed something wasn't right. Pulled over and my truck was running really rough and the idle was loping more than it usually does. Along with that there is a massive loss of power. Pulled it in the garage and thought it may have been a timing issue. Nope. Timed it and it was good. So maybe a fuel delivery issue. Just rebuilt the carb and put it on and replaced the vacuum cap on the carb because it was torn (thinking oh it coulda been a vacuum issue). Test drive it and still a loss of power but it does now lope as bad but still runs rough. Any troubleshooting y'all can help me with?
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