Swapping A 327 into a 1995 GMC

Hi All, Hope everybody is having a good day. (got to be better than mine) Anyhow I have a 1995 GMC Sierra 4x4 with a 350 and auto trans. Well, Yesterday it was running real sluggish like a vacumn line was off. Checked that, Nothing, Checked to make sure all plug wires where on, They all were, and so on. I waited a bit and checked the oil, either a head cracked or the block did because the level was half the way up the stick. So my questions are Can I drop a 1968 327 engine in there and have everything line up and connect the fuel system, distributor, and so on and have everything thing bolt up including the transmission (a 4L60E) without any problems? Really what I need is if the 327 engine will work exactly wht needs to be done to make it work. I'm on a very tight budget is why I cannot afford the correct engine to replace it with. Thank You All That May Reply,     Frustrated In Ohio