hedman "tight tube" hedders?

Thanks , one less expense . That is one insane project ! , Just showed it to my son and now he wants to try something like this . Well I do have 2 spares , the orig motor and a 72 340 in the garage .
What compression are the pistons you using , 8:1 or a bit higher ? What about supechargers , had one on my T-Bird and it was dead reliable , 500,00 km and not one prob , didn't even burn 1/4 quart of oil between changes . Any body ever supercharge a 340 ?