KA24E Rebuild or KA24DE Swap & Rebuild

well i got quoted from varun in the summer for an s13 sr20 blacktop with all stock parts n installation for $4500 … im not dishing out that cash into an almost 19 year old car … if i had lets say, an s14 95-96 with no rust then fukin right, id go s14 sr20 np lol … jus i have bigger n better plans … like i mentioned b4, im saving up for a 350z n then ill be investing into that car … i jus want my 240sx to last me for another 3-4 years without putting a lot into it … ive already started doing the suspension it which is key for now …