Sounds like you have an early 3.7L without the updates if you have overheating. I know how it is once you've made your mind up, but I don't think you'll be as happy with a 4.3L as you were with your 3.7L. I'm sure you also know that an outdrive swap will be in order as well as new mounts and bellhousing. If your set on swapping, I would find a complete assembly in a junk boat somewhere for a bone boat.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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