Will this be a problem: fan vs. Radiator?

Oh, heck no! I'm convinced. My spacer is only 1" thick. That might be hard to shorten. 66 valiant528 had a good idea to move the core away from the fan by re-doing the brackets. I'll let you guys know how this sorts out.
Don't try to shorten your spacer- just get a shorter one. New or place an ad on the forum for a used one.
https://www.ebay.com/itm/3899576607...eZRwJpKXH0Oh/CCtq3Gcc16rQ=|tkp:Bk9SR8i4vpyCaA
Shorter spacer = great idea! I tried bending the blades towards the rear, but there's so many radius and creases in the metal you can't hardly do it.
For heaven's sake, don't try to bend the fan!! you could weaken the blades or throw it out of balance trying to do that- and you don't want to see what happens when a blade fails at speed...