Sometimes they break just after beating on them, a day after beating it, could have developed a stress crack and finally went.
I would do a L32 build if you have extra cash, the l67's are hard to find as it is. Just leave the bottom end a lone and find a good tuner. Put a s2 full size genv blower intercooler on, then decide on cam or rockers. You will need a built transmission eventually.
There's been cars with 200,000+ miles on stock bottom ends run 11.2sec, stock bottom ends making 600+whp, it's not uncommon for stock bottom ends to perform well, it is fairly common to see modified bottom ends get destroyed.
