84720kid

where should i look for parts?

im still new to all of this and i was wondering if the z24 is buiable. i was thinkin about buildin one on the side while i drive my truck then droppin it in later once its done. i have a 84 720

so last year my timing chain went out so i tore my motor apart to replace it and realized it was just time for a whole new timing chain set. about 7 months ago was when i installed the new timing chain set then 2 weeks ago my guide broke again. it this just a crappy coincadence or is somthing wrong that i dont know about? i have a 84 720 with the z24