slight firecracker pops out exhaust

Timed my 318 today,still getting a slight firecracker pop through exhaust at high rpms....It is bored .030,360 heads,.464 cam with .292 duration,600 eddy with a performer manifold,stock mech fuel pump.My buddy stopped by and suggested that it is starving for fuel and too much air is getting into the cylinder which is causing the slight pop...any thoughts?Its not consistant like a stuck valve and no back fire out the carb...