Need a slant 6 replacement

A v8 swap also requires a driveshaft, transmission, radiator(usually), assorted brackets for accssories(alt/ps), hoses, and reworking the electrical wiring.

Where is the block cracked? What is it leaking? Does it currently run? Another things to consider is that the slant six crankshaft output flange size changed around 1968 (i don't remember exactly which year). This means that there are some obstacles to overcome when swapping in a slant that you should know to look for if you want everything to live a long and happy life.