I hope I didn't over rev my motor?

haha :) i know what your talking about I too floated the valves in my 68 289. but i wasnt as lucky. i busted a lifter :S going about 65 in 2nd gear 3 spd auto tranny and 3.00 rear ( i think) it ticked a bit afterwards ......oops. :)

but yeah it could be your secondaries oppening orif it permanently sounds different, look for pin holes in the eshaust.

gave me a damn good laugh!