Here,s what you do look in the Moog TRW or sealed Power Spring catalog for your application and it will state all 69 chevelle models small block std. sbc heavy duty sbc with A/C and SBC H/Dwith A/C then it will list BBC std BBC Heavy Duty BBC with A/. C and BBC Heavy Duty with A/C. Pick the one you need . A word of NOTE here ALL AFTERMARKET coil springs are 16% stronger than the factory units, they will raise a sagging car nice . I would recommend changing all four so that the car sits even all around and has a nice stance. You might want to consider using the CARGO COILS in the rear. I have done this a few dozen times for customers through the years with good results. All of the springs will raise the car over a new factory spring it will drop a tad after a month but not much maybe a quarter to a half inch at the max and then stay there. they list all the springs for 6 cyl sbc and bbc 2 and four door and convertible. Hope this helps you. Alex