Clois,
My old radiator was brass and sat in front of the steering rack and behind the sway bar. My new rad is so wide that it wouldn't fit there so I wound up putting it in Front of the sway bar. If I had to do it all over again, I would have had a rad made to my specs as Gary said. If you're not going to use coolflex hose, you can even get a larger port put on your custom rad to match the larger diameter of the water pump inlet. My rad is vertical but some like to shoehorn them in on an angle. Call your place in Indiana and see if they make custom rads. If you do go the new rad route just take your time and make one out of cardboard and test fit it. You don't want to get stuck with a $400 rad that won't fit which you can't return.
Also, check out the formula on the purple ice bottle, the less anti-freeze the better. Fill your entire system with water, then drain and measure the volume so you can get the right ratio.
My new cooling system cost alot of time and money, but it is nice to drive now with both eyes on the road instead of one stuck on my temp guage.
ps, I was so obsessed with keeping cool that I even put an
oil cooler in. --That was definate overkill.