7AFE to 5SFE Options

[twolownissan2002]

Ok so here is what i want to ask i have a 94 st auto everyone knows that it comes with a 7afe. The motor has around 210k miles and its had better days. I have had the car around 4 years and my ex girlfriend ran it with no oil for around 200 miles lol. She says that she checked it but ha whatever done and over with now. So i was in the the works of getting a 4age but i found a really good deal on 97 gt 5 speed and the motor only has around 80k on it. Well my question is that how hard would it be to change over from the 7afe to the 5sfe. I have the complete car with everything there is runs and drives great but the car was rolled a couple of time lol. So i only paid 300 for the whole thing. Then i thought about it and if i get the 5sfe into it i would be able to drop the 3sgte in it instead of the 4age with out having to mod it again. Just want to know about how much work im looking at and is it worth it?