440 stroker roller rocker adjustment help

I didn't do the initial adjustment the engine builder did before the dyno brake in of the cam and rings . they did a few dyno runs after brake in and then I ran the car about 1000 miles changed oil and added the comp cams brake in oil again and then had them cut the filter open and it all looked good then I ran it for about 100 miles little harder doing full throttle blast on highway and some burn outs for some friends and family on the forth and seems when it gets up to temp and at 2500 on the high way I hear upper end rattle and when at idle it sounds fine . it has 391 gears and 4 speed with the overdrive