I have 96 astro van with a 4.3L v6 that has either a brocken con rod or piston . Is it possible that a 4.3 short block from a truck or jimmy will work with my heads and intake .In other words are the cranks the same in all these 4.3s ( even different years) .The reason i am asking is i have a early 90s 4.3 that is complete to sawp parts from .