Michael Yount
Mustang Master
Actually, if you run it the other way in series - B&M cooler first, then the radiator cooler, you'll solve your potential low temp problem. If the B&M overcools it in the winter, the radiator cooler will at least help to take it back up towards the coolant temp (180F-190F).
Way too cold up here to do that. The easiest way to plumb the cooler is to remove the lines as they go into the radiator and just slip them fittings and all into the rubber hoses that come with most kits. A couple of hose clamps and your done. Mine has been like that for 10 years and going strong.