89 360 vs 71 360

I have a roller LA360, and I am going solid flat tappet and ductile iron 1.5:1 rocker arms. I want to minimize the potential points of failure.

I can't remember what year the block is, somewhere between 89 and 91. It came with the 308 heads. One was cracked at the exhaust valve, so I had to buy another, so I'm into it for about 350 plus my gas.