Rhonron,
I am sorry to hear this and on a supra, That is a major bummer. What are you looking at doing from here. do you want a basic set of instructions to rebuild the motor yourself? are you going to purchase a new, reconditioned or junkyard motor to replace the motor?
Also it is really helpful if you could give me exact year, model and motor to help me recommend the correct parts.
I kind of need to know what route you want to go and what your skill level and tool kit size is and what budget you have to move forward. I won't say you can't do it on your own in your garage as many years ago i did it on my first car when i threw a rod through my oil pan from pretending i was a race car driver. lol I was only 16 but had resources in the way of my father and grandfather for knowledge.
Basically what i am saying here is better make sure your bus pass is good as driving it for awhile is not an option.
in any event you are looking at between $3500 and $4000 to get a replacement block and up.
[link|https://titanmotorsports.com/products/toyota-genuine-shortblock-for-toyota-supra-1993-1998-2jz-2jz-gte-11400-49088?variant=30383619276890¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&srsltid=AfmBOor_4kVNffqXrWvx7i80ITnl7DuD75UL_VoXa3djWvE6ydyjLDTLWvE|Replacement block|new_window=true] 2 JZ replacement ( I am guessing here )
If you have any questions feel free to ask. I don't mind answering if I can, i have at least 3 decades of car repair professional as well as private under my belt.
Let me know, sorry bro.
Monte