Joined: Nov 2016
BlackSunshine, this is one of those things where there have been a few bad decisions made, but there's no need to keep going down that path out of sheer bloody-minded determination. I am glad that the new outlet works! However, risking overheating your engine and causing catastrophic failure while just driving around is probably not worth it.
I run into this a lot in my job, fixing computers. "Ma'am, I'm sorry, but this antivirus program is actually malware, and it's not protecting your system - it's causing problems." "But I paid for it! I still have 8 months left!" "Yes, but wouldn't you rather have a program that actually does what it's supposed to?" ...
... you can see the similarities in the situation here. But I don't say these things to make you feel dumb or hurt your feelings in any way! Not knowing better, I've made a lot of choices with my car that I had to go back and fix later. I just want to save you some major pain!
Since the pump is effectively new, selling it so some drag racer can use it would be the best possible outcome right now.
In answer to your other question, the high-flow pumps are sometimes fine, but pulley diameter for them is important. Many of them will cavitate, creating tiny pockets of vacuum and supersonic shockwaves that hammer the impeller and eat it away like tiny sledgehammers, when you spin the engine to high RPMs. In the end, a stock pump often works better. Your best bet is to go with a good 3-core brass or 2 core aluminum "big block" radiator and 7 blade thermal clutch fan, or electric fan. Clevelands have some oddities about their thermostat, but you can find plenty of info about that in other posts.
I smile a lot. It makes people wonder what I'm up to...