measure the clutch and the bell. If the gap is too much reline the bell with a thicker liner and your clutch will probably last a very long time.
I used the stock clutch bearing block but lightly sanded the two halves so it'd grab the pinion bearing a bit tighter. Lots of guys are putting in a metal bearing block.
I used an aftermarket frame bolt kit. I've seen the stock bolts get jammed into the frame where they had to be Dremel'd out.
I had to sand down the rear main bearing block bolts to clear the linkages.
Everything else on mine is kit stock. Loctite the boom support bolts in place!