Replacement Radiator Help and Alum vs OEM style

As usual got distracted by another project today but started getting ready to mount the OEM shroud to the New Rad and realized the standoff where the Shroud mounts is much different on the New Rad which will leave a big gap at the Top and Bottom which isn't optimal by any means. I've included pics of Old and New for comparison. I could braze an equal height panel in on the top and bottom but jeeez this is getting pretty involved or I can just mount it as is.....Any thoughts and No Wise Cracks from the Cold Case Guy as my meat already hurts from stepping on it..Ha Ha ha

View attachment 1715434682 View attachment 1715434683 View attachment 1715434684 View attachment 1715434685 View attachment 1715434686

I would attempt to fill those gaps/seal them with something, if at all possible. You want to draw as much air through the fins on the front of the radiator as possible, to optimize your cooling.