Something to note is a Mexican block is NOT setup for a hydraulic roller cam. You will either need the retrofit link bar lifters if you wish to run that style cam or you will need to tap the lifter valley to accept the spider and use the stock style lifters and dogbones. This route will require the use of a reduced base circle cam though. Both routes will require you to measure for a new pushrod length.
Pic of the comparison of mexican block cap vs stock block cap
Pic of the comparison of mexican block cap vs stock block cap