The secret to LSA is the correct one for the engine.
D. Vizard lists lots of cams in his SB Chev book. From 302 up to 434 [ stroker ] . Even the mildest engine, Street & Tow gets a tight 104 LSA for the 434 & up to 110 for the 302. What gets changed is the duration, 199 @ 050. Same 199 @ 050 duration for 302 through to 434; LSA is the only thing that changes, decreases with cu in.