fooling my small block

My impression is, you want a sound, and that's a foolish want...lol. The narrower LSA will not help with too-large a port, nor with lack of static compression. Think about two of the same cut keys on one ring. when they are stacked, they overlap identically. As you scissor your fingers and they seperate, less and less overlap. The further apart they are, the less overlap there is. Cam lobes are just keys on the same ring. For a given size lobe, you can only overlap them so far before the exhuast is flowing up into the intake at low rpm. Tighter LSAs tend to make peaky power, and hurt low end response and performance. The amount of hurt depends on a lot. You see a lot of 112 LSAs now because it flattens out the power peaks without sacrificing too much overall, and keeps the low end as best as possible. If it were me, I would go with the Crower split pattern and install it at 112 if you plan to squeeze it. You will want as much cylinder pressure as possible. The 108 has that idle sound because at low end it's not very good...lol. With NOS, that can mean a bad studder and pop at the line when it's hit.