Well Damn thats a bad ass truck!!!!! I have worked on a few of the 521,s and 621,s. The front spindle set up is a little off from everyone else, so it makes it a little hard to switch to a different set up(Altima Charlies crown uses 91 toyota supra spindles). But I have seen the ratsun kit, It will get the job done. And switching to a 7/8 bore master cyl is no big deal either. Let me know if we can help you at all.