SO whats a jap spec sr20 turned the god intended way w/ a transmissino that might happen to go into a 510 go for these days?

If you're asking how much, anywhere from $1500 to well above and beyond. You get what you pay for.

You might want to try www.heavythrottle.com or www.projectsilvia.com or www.nissan180.8k.com .

They are good sources for engines and other assorted goodies. :D