Well there is the chance that it is a 4 bolt, because when the emissons bs came about, gm would put truck engines in cars. Which was the wrong way to go about doing it, but since the trucks were usually outfitted with smog heads, and had milder cams for heavy work, they opted to put them in cars. I have the build sheet, and although it is hard to read, I swear it says 4blt on it. Has the lm4 engine code which was the same for the police cruiser novas. Too, bad this is a 4 door, beacuse we have all documentation on it, and our friend we bought it from was only the 2nd owner. We shall see.
