Basically....... the available spring installed height determines the “group” of spring you’ll be looking at.

Stock SB heads utilizing stock style multi-groove valves end up with a pretty short installed height(1.650”-1.700”)...... and they’re aren’t many choices suitable for the 590 cam with that combo of parts.

Ede heads are a nominal 1.800”........TF heads can be 2.00” with their Ti retainers.

You wouldn’t normally use the same spring for the same cam with those 3 different heads.