'89 360 LA valve spring/cam confusion

Good choice
The Stock HR should be fine with your compression and gears
Easy to change later if not
I'd cut the guides for viton seals while apart
and do measure your spring height and write it down
no rotators? you got lucky
post up your compression after you get it on the road
cheers
check your springs on a spring checker
Wyrmrider, I am having the heads done by a recommended shop. He will insure everything is as it should be.