Best block for mild small block project?

Tried search but did not find a clear answer what would be the best small block to go with on a mildish engine project. Target somewhere around 400-500 hp, most likely stroker crank and hydraulic roller cam with alu heads on top. I'd be tempted to go with a 318 LA block since my 69 Barracuda has a similar engine on it already, and up here they are more readily available. Also if certain year models would be better for any reason, it would be nice to know it now at planning stage...

And no, I will not modify the original engine, just putting it up to shelve to collect dust. :)

Thanks.
Author: admin