442 ci. Stroker

http://www.forabodiesonly.com/mopar/archive/index.php/t-128845.html

BPE selling the rotating you are looking for

for the 650 hp limit for OE block I dont mind
mine is pushing really close to 600 and it will
be hit by nitrous next summer

I saw R block split with less 600 and
OE block survive with more than 600

sonic test the block
have the rotating balance by the best shop
dont swing it to high for nothing(burnout and donuts)

like you saw on your son's car vibration is your enemy
and engine well built,well balance will last
maybe not as much as an R block but will do the job

my .02 cents