Keep looking for that 270/302" engine as your in the right spot (Texas/Oklahoma) to find one and it can 'turn up' when you least expect it
increasing the value of your truck by 40%.
Try Ken Neal @ (918) 605-2248.
Good luck.
PS: Perhaps 'shatter' was the wrong term. The heating/cooling of cast materials (hairline cracks) is the factor I was speaking to, as this process is very difficult as Robert pointed out.