[mongocanfly]

if your gonna do a frame swap then the blazer will be to short...
if your gonna do it ,a frame swap will be easiest...
your 2wd parts more than likely won't work on 4wd..
keep in mind if you use 67-72 k20 axles you'll probably wind up with a ho52....very hard to find the expensive to nonexistant parts..and fronts are likely to be closed knuckle with drum brakes
it'll be a big job to use your original frame and try to get axles under it..