You could probably get some money for those heads, enough money to buy a head with a 72 cc chamber from somebody like AFR. That way you could use your quench piston. Since you're supercharging, those giant intake runners aren't as necessary as on a NA motor. The supercharger can overcome them. The smaller runners will decrease compression pressures, but you can dial up the boost, forcing more air through the small runners, to bring yourself back to the detonation threshold. Detonation occurs when cylinder pressures are too high. Now, you'll make more heat in the intake charge which brings detonation on a little sooner, so you wont make as much power as the big runners with less boost. They do sell intercoolers that fit under superchargers which will fix this. With an intercooled setup and a good quench on 9.0:1, you could probably run upwards of 12 psi of boost and make somewhere around 600-700 hp on gas.