I have 86' 20'eliminator scorpion w/468 BBC said to have 500hp(?), berkley droop snoot. 73mph on gps, I,ve noticed the impeller is chewed up can anyone tell me what impeller this could have? 73mph@6,000rpm and should I go SS? other question the edlebrock tx-2 tunnal ram has a pair of holly 400cfm carbs is this enough? was told to go to 660cfm, but can not find any! THANKS!