Mostly i think it comes down to how quick you want to go . And how motor fits your car .
Big block stock stroke with reasonable rpm will last well in stock block . Aluminium is $ and iron are thin on the ground . Is Bulldog still releasing blocks ? What happened to Callies ?
Small block seems even harder to deal with than big block .
Gen3 seems ok , but you see guys moaning about lack of good blocks even now . Plus decision of efi or carb .
I have 2 rb motors now , one a factory 440 and 1 a World 505 . The 440 short has been together since 2007/8 with a couple different cams and heads . It has gone 10.70@3690 , World is below . Stock block stroker lasted about 18 months before splitting block .
Is that quick enough ?

Tex