Dwayne spec'd my cam as well and i'm very happy with it. Engine runs great and very responsive with decent vacuum, but like you say, always room for improvements. That's what keeps this hobby interesting. My Thumper carb is awesome as well, but I may be able to lean the jetting a bit in the cruise mode and add a vac distributor. These engines can make big power and get reasonable fuel mileage too as Dom has a customer with a large cubic inch big block making big power running the power tour getting 16 MPG. So gas miser or not better fuel mileage with these big engines is possible.