Engine rebuild

Rebuilding an engine is very broad, too broad.
 
Choice of parts, types of work done, done yourself or by a professional.... leads to a bill of $2000- $20,000....
 
Buy another motor and drop it in, mystery how long it will run for.  Rebuild and get tempted to do a few upgrades, and then a few more, then you have dropped your saving stalled project waiting for your next pay cday (lol)
 
I am less than half way through a rebuild on a 3sgte, total block / head rebuild is budgeted at $10k+. (full rebuild, gaskets, forged internals, head work, valve springs, cams, etc).

I'm halfway through mine too. Still need to organise turbo and such.

Pistons, Rods, 272's, springs and retainers, 1mm oversized valves, brand new gaskets, collets, seals, valve stem seals ect.

It's around 5.5k in parts, top end From America so also paying postage on top.


Anyway back to the original post. Why are you wanting to rebuild it?

How much money you can afford to spend?
If you intend keeping the car, the cheapest option may be to rebuild your current motor. Then you'ill know for sure what you've got. 
A 3sgte, or beams etc, would cost many thousands more by the time you get it fitted and working properly, keeping in mind that any used motor is always going to be a gamble.
 
 
 

Multiple things are different like brackets, wiring ect. but with what you have now you should be able to make it work and buy a couple of things.

I've done two MR2 BEAMS swaps and I wouldn't recommend you buy that Celica and try to swap the engine into your SW20 unless you're ready to spend some proper money on it.
 
Aside from the fact that you can't tell anything about its condition, there are also a number of other things you'll need to do to get it running properly in an SW20 – like tracking down an original BEAMS MR2 OEM airbox and intake piping, having parts of the exhaust refabricated, and more. Finding some of those parts isn't easy (or cheap). In fact, the airboxes are almost impossible to find, and the engines don't idle properly with pod filters.  Unless you're really good at wiring, you'll also have to spend several hundred dollars getting someone else to sort that for you. The BEAMS engine loom in the Celica isn't going to work in your MR2, and the loom on your ADM GT isn't suitable for the BEAMS engine either, unless it undergoes major surgery. 
 
Much as I love BEAMS engines, if you don't want a bad case of OMG! 'bill shock' , I'd recommend you rebuild your own motor.  At least then you'll know what you're getting into – and getting at the end. If you really want to go BEAMS, save some more $$$ first or it could all become a much bigger headache than you're ready for!
 
The fact of life is, doing an engine swap properly isn't a cheap option.

No Phiz, I got no idea on how to take out myself lol

Thank you Dudeman, I guess my wise option is to rebuild my own engine n hopefully it's last another couple 100ks