Dual exhaust is tight on these cars with how the gas tank is mounted...you may have to modify the exhaust if you already got it on with the taller springs, lower it and things will be more tight...might be best to leave the rear height for now, you might end up liking it...your dad must have liked it! Car is looking sharp....it’s different and I like it!
I noticed in your pictures of the interior parts, there are several parts that don’t belong with this car....must have gotten mixed up over time.