No, he doesn't need premium gas, since he has to get good pistons, go with dished pistons. Remember, 87 octane can handle around 15:1 compression without pinging, it is the combustion chamber and hotspots within the combustion chamber which will cause the pinging. If it doesn't ping at idle, it is a matter combustion control and spark advance curve to prevent it. You are still going to make more power with the added forced induction, even with a reduced or slower advance curve. So what he will need to do is calculate the needed dish piston in forged or hypertec to get an even 8:1, edge the combustion chambers (these should be closed chamber heads, edges need to be rounded, valves need to have sharp edges removed, too), and yes, control that advance curve. The computer controlled cars reduce advance when boost kicks in, same with NOs systems, same thing here, right? Helpls save the engine from higher temps this way, and, one advantage is, add higher octane increases power, but he can run around with 87 octane without a problem, save a bit of money and not have a problem if he gets stuck somewhere with cheap (quality) gas. And yes, two small turbos, one for each side, and the intake is right there, and the carb is right there, and yes, it would be pretty cool and compact, not so much ducting all over the place to hide the engine.