dssur
+1y
rebuilding is nice but spending that much for so litlle hp doesnt make much sense. Instead of talking about alternative swaps, and assuming you are happy with the mazda motor, just find a jdm engine importer. You can get a 30-50k mile 2 liter for 5-800 bucks. If you rebuilt it, you'd spend that just at the machine shop before buying parts!
I have a jdm 2 liter in mine and it is super sweet. Bolts in because its the same exact engine, you just need to change some of the accessories, the distributor, and the intake, all of which SIMPLIFIES the swap.