Help me build my SB Stroker

Adding 40 cubes in stroke can eat up 10* in duration. All that extra stroke provides a serious torque gain that comes in quicker and ends sooner, a shorter rpm band. It has to do with piston speed.

This increase is huge and it needs to breath. Increased cam timing is with all this stroke doesn't go far as compared to the shorter stroke of the 360 (3.58) or the almost mini stroke of the teen or 340. (3.31)

Idle quality comes with the cam design, ramp rate and overlap.
Sound of idle also comes from the above but is made more prominent by the amount of cylinder pressure, header tube size and to some extend, design, exhaust pipe size and length, muffler type.

Add in all that extra stroke, it mellos out a little more.

most cams are ground on a 110 C line and sound fine. Try a 106 knocked down 2 degrees on the road in a short stroke engine. Many would balk at the idea just on sound alone