a fac LT1, puts out 300hp rite? the one we have our hands on has Alum heads, they any good?? what did the car run down the Qt when it was new? and now we are looking @ a hot cam kit 525", and some headers with 15/8 or 13/4 primaries with 3" ex to a flowmaster, how much HP would that combo breing, and how fast would it do n a Qt??