Any drawbacks to using 1985 LA block to build 408 stroker?

Yes I would have the block Sonic tested and Magnafluxed to make sure it is good to use. Staying with the LA block would allow me to use the same intake and other parts from my current engine (would save some money) vs going with a magnum. Also are things like aluminum heads more or less expensive for the Magnum?

I'm not sure what the number after 360 is on the side of the block, I guess I can check with the seller. What does the lower number mean?