I have a 68 convertable that I put a big block in, and have been told a few times that I had better put in subframe connectors, or after a while I wont beable to open or close my doors. My question is, how do these bolt or weld up? I have seen some of these in Summit for close to $100 but I have heard that I can do the same thing for $5 worth of metal. Also, how would this effect the cornering of my car? Thanks to anyone that may beable to help.