flathead31couple , just leave the engine allow . just bolt an 6 or 8 71 case without rooters on the intake , put all the drivers on . just for show . if you can't do the math . then save yourself a lot of damage and trouble , not to talk cost . compressed fuel n air back fires through your intake system will scatter the case of that blower into deadly flying parts all around . the belt and gears will give you the sound your looking for . and the extra heat that created is very hard to dump off as well . an 8 case is cooler looking and will fit the 6 71 foot print . i'm not just blowing hot air , lol ;)