Need help transferring 74 block parts into my new 89 block

Owen Diaz said

Had a 74 360 running good but unfortunately it threw a rod and now I’m back to rebuilding and bought an 89 block without knowing that’s it’s a hydraulic roller cam instead of flat tappet now I was just looking to know if and how I can use the flat tappet cam,lifters etc from my 74 in my 89 block I was told something about having to send push rods to the machine shop

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everything will go in (the cam/lifters) the deck height should be the same. but check your pushrod length when it gets to that point.. the 89 is still a LA block just with the roller lifter bosses (i want one of those blocks bad) I believe the deck height didn't change til 93 or whenever actual magnums came out.

I am not a expert though.. someone will chime in if i'm wrong