...A 1984 chassis will give you way more ease in driving pleasure than the stock one will...
my smelly old 2 cents...
MikeC
I can't quite understand this comment.
I've had lots and lots of fun and pleasure driving my pretty much stock old trucks.
Given the trouble, work, and incorrect width of an 1984 front end having to do the conversion or swap likely would take all the "pleasure" out of it. I think you'd have a lot of work and very little to gain, and might end up with a funny looking truck..
Engine can be removed after removing radiator and hood... On a Chevy the engine has to almost stand on end to slither out and it is quite tight. On the GMC the top of the radiator support comes out which gives some more room, may not be as bad.
Even so it will be a whole lot easier and safer for the rest of the truck if you remove entire front clip, not many bolts holding the fenders to the cab and only two for radiator support to the crossmember. leave the radiator in place and take it along with fenders out as one unit.
Grigg