Which 360 Block to use: LA or Magnum?

Thanks guys for all the great input. FWIW, I've not been messing with my cars for quite awhile now even though I do go to Carlisle every year just to drool all over myself...LOL. Now, I got a little time & money (retired), I want to get back into em....besides, I got this little ***** of a Camaro down the road that I want to smoke in the 1/4 mile....LOL. He refuses to run against my 392 SRT8 Challenger, but never missed an opportunity to punish my poor, old '73 318 Dart Sport. That's fixing to change...big time. :)
So, I had to do a little inventory-taking out there in the shop over the weekend. I have a couple good 360 LA short blocks, 1 340 short block, 4 complete 318s, 2 complete 440s and that one 360 Mag block that I can't even remember where it came from. I know its not something I would have bought. Maybe got in a trade or something.
Moper, I agree with all your comments for sure. I'll be running a roller cam which I haven't yet spec'd out and looking for 450-500 horse which should be plenty in that Sport. The combo needs to work with my built 904 and the 3:55 gears in the back. It has to remain reasonably streetable whatever that means...LOL From what I've read, those EQs flow better than any of the stock heads ever made thus the reason for that choice. I do have a decent set of early 340 "X" heads and an early 340 non-EGR intake, but was saving those pieces for another project that needs to be geared more towards an "original" so to speak. I've got 2-3 sets of various 360 LA heads as well, but I don't believe they would flow enough for that amount of power without a lot of porting expense.
One other question for you guys running these strokers. I notice that the kits can be had balanced or unbalanced. Are you guys buying them unbalanced and using a 360 external balancer? Or buying them balanced and using something differ for a balancer?
EDIT: I remember I did all the oil modifications to one of my 360LA blocks a good while back, and I think this is the block that will get the green light for the build.