what would be cheaper on my mazda rx7?

[0b1]

i have a mazda rx7 88 na and it needs a rebuilt engine some off u may now that rx7 are rotary and i hear its expensive 2 do a rebuild on thouse engines what would be cheaper rebuilt the engine it has or swaping the na engine and puting in a turbo 2 engine swap or wut engine would fit in it good for cheap but prefer 2 keep it rotary

 

[Mark]

its cheaper to buy a rebuild with a core exchange. try here
http://www.automotix.net/engines/mazda-inventory.html