maz2low
+1y
The best option is having a custom made Aluminum radiator like I had done, although it cost alot.
next best option is having your stock mazda radiator recored properly to handle the 4.3 or 5.7L engines probably the cheapest option and saves time with mounting since it bolts it. Another option is using early 80's style corvette radiator very short, correct width, just need to make custom mounting brackets. I have done all three options. Personally the aluminum radiator although more expensive is best.