I was wondering how well my stock bottom end will hold up with my mods.the bottom is from a 72 impalla , it is cast and the con rods are from the same engine. My engine goes like this, 71 block with 4 bolt mains, stock main and con rod bolts. federal mougul flat top alluminum pistons, heavily ported 882 heads, close to the GM 151 cam, headman headers, edelbrock torker intake, and performer 750 carb.
It seems to be holding up fine but I am putting on aluminum heads, and if my budget will allow it, a big roller cam with roller rockers. But just to figure for the time being I'll say a comp cams extream energy 286 i think thats the number but not sure, any way its two sizes bigger than the 268.
This motor will frequently be reving around 6000 rpm. so with theses mods how well will it hold up?

 

6000 shouldn't be any problem with the cast crank.