is this true about a 350 sbc vs a sbm

Longevity on any motor depends on who assembles it PERIOD. Start with a good old nickle block, a steel crank good rods and forged pistons. Balance the assembly and bluprint it and make sure the tollerances are correct. I have seen too many so called engine builders who shouldnt be engine builders.

For that guy to make a statement like that, he has his head up his ***, and that mini spool will be in pieces all over the street if he ever hooks it up.