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Ok, here is my 2cents , I had a warmed over 390 in my Cobra for three years it had 314 hp at the rear wheels with stock heads and rotating assembly. It had a mild cam and aftermarket intake. I ran it hard and never had a moments trouble out of it. I came across a 1967 police interceptor 428 and built it up to about 540 HP at the flywheel : what is the differance ? Well its the pitch of the tire burning when you launch it hard . Both will blow the tires off the rims . Yes 428 is faster but you are paying $$$$ for the added HP . So don't over look the 390,s as it is a reliable , fun engine and can be built for a very reasonable buck .