Rebuild costs?

well i am just comming out of high scholl so until i find some were to do my apprentice ship i will be driving a stock 240 or neer. I am yet to buy one just trying to find out a litle more about them.

I have heard that the SOHC makes the car feel underpowered but i am only going to use it until i have enoguh for an SR swap or possibly buy a newer KA (DOHC) and make it a KA-T. Since the magority of 240s are higher millage just seeing if i will get into trouble with the engine befora i can afford a swap.

Also will the DOHC just drop into a 89-91 with out anything?

A little more searching around and i found a shop in aurora i will give a call about cost but about the costs but other questions still stand

thanks for the help