Well I've since did some searching and IMO the best solid mounts are HP Motorsports or HPM (402-731-7301). I bought their extream duty solid drop mounts for my 418 but for 10 bucks more I also bought the 3/4" solid spacers that raise it back up to stock height. If I can run it at stock height (hood clearance) then I will do so for header to ground clearance. Also I know mine with the canton 7qt pan clears with a ton of room to spare lowered with my flamming river rack, but others have had to shim 3/8" in order to clear a power steering rack so that may need to be taken into consideration when planning things out. I've seen the UPR's in person a couple weeks ago, and for a few extra bucks I'd go with the HPM's. They are built different than the UPR's and are one solid piece. As far as header clearance. With a stock K member there may be issues with it lowered. but i've seen a lot of people have to notch the stock K member out regardless with a 351w base motor and larger headers.. I am using a AJE K member which frees up a lot of room.. header size may play a roll