4.0 Engine Rebuild for 89

I need to find a cheap (but hopefully good) rebuilt 4.0 engine for my 89. Does anyone have a recommendation?

Thanks!

actually i have a 89 xj ltm and i had the engine rebuild all from spare parts at an auto junkyard ... hell if you wanted to be lazy you could just tottally pull a newer working engine out of a newer model and its pretty damn cheap