A friend of mine had a 70 nova with a big 10 bolt, 393 small block and nos. Drove it on street some and 1/4 mile alot. Ran 10.50 for years. He sold the car to another friend of mine who put a 468 in it with nos. Ran 9.80 1 weekend and the rear end let go. Only had a stock cover but it pulled the bearing caps off. With up graded parts it should be ok................. for a while??