you will need the 8 dogbones and tin retainer with 3 bolts.

either from the mag engine or the 90 core engine.

I recomend pulling each lifter apart and clean them while you have them out. I have found most used roller lifters are dirty with grit/carbon build up. on some engines I have fix the ticking by a lifter service. they were pluged up solid.

I do mine on the bench remove clip/cup/piston wash with brake clean,oil, put them back together. I dip the roller end in oil when droping them in the block. they pump up after fire up, rattle till all air is removed then no noise.