My best advice to you would be to bring your rad to a competent radiator shop and have them do a flow check. If the thing is getting to 250 on the highway you have some serious efficiency issues with your cooling system
Long story....Started the original rebuild with an original rebuilt by me carb. Didn't run a cap used the hose. Plus we have tons of calcium. I said my Hail Marys.
50/50 is perfectly acceptable. Too much antifreeze and you might have overheating issues. Also. I apologize, I didn't mean to stomp on your want ad. Just trying to save you some money and frustration
The shock display! Its sitting in my office with the rest of my assorted automobilia Im going to swap out the Chevys for Buicks!