tbh i personally don't think the block would be a problem. The production 200 blocks themselves aren't exactly special, i mean i bet you've seen just as many if not more cracked 200 blocks

the only thing i will say is that a 205 block in a 4wd car would probably not handle that power...the 200 block was strengthened to deal with the extra forces/stresses of the 4wd system,

best bet if your worried is to go for a new motorsport 200 block if you can find one!!

but at worst if your 205 block does break, it'd just be a case of swapping the bits into a different block, it's not as if it'd explode and damage the whole bottom end!!