will it want a cam with the wider LSA

Narrower: short rod makes piston motion faster around TDC.

LSA is just a number, it's derived from your cam choice - it doesn't determine your cam choice.
You will see references to a big LSA, but it' not relevant - that's a cam with so much duration (280° @ .050") that opening it up makes the actual OL window closer to what you'd expect.

Vizard's guess as estimating the actual area when both valves are open: proportionate to the OL in nominal (not .050") degrees, squared, × .01.
E.g., IO 40° BTDC + XC 50° ATDC = OL 90°: OL area = 81 "units". Small changes are important, going from that to
IO 50° BTDC + XC 60° ATDC = OL 110°. Looks like +22% (110 ÷ 90)?, but the OL area = 121 "units", 49% larger.