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i just finished a customers 1984 mustang..motor is a 347 ci all forged lower end..rpm intake msd stuff..built c4..4.10 gears..i ported the stock heads ..big valves etc..(heads flowed a tad better than stock gt40 heads)..but we went for a 40 mile drive(i drove it) , then he drove it another 60 miles home..with zero problems..we took it pretty easy since its a new motor , i got down in it a little..it pulled good till 5800-6000 area..then the heads started showing the lack of air flow and the power fall off..but over all i am very satisfied with it ..he called once he got home and is tickled to death..there is no doubt that it will run at least 12.50's or better with slicks
 
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