I have a 1973 Challenger thats getting a BRAND NEW WORLD PRODUCTS 572 inch 4.500 bore X 4.500 stroke MONSTER STROKER motor and I am trying to get into the LOW NINES.... at a dragstrip NEAR YOU!!! The sleds are put away and the challenger is in the garage.... have a HAPPY SUMMER.... I'll be on www.moparts.com Gary Oles nosboy 