73' B3 340 Duster pro touring build

well Ladies and Gentlemen, today I made a crucial decision regarding the build in the near future it looks like I will have to start a new thread with a different Title....first off though I made major steps in installing the quarter panel, I got the door hung and aligned with the quarter panel and tack welded into position, The door jamb area was plug welded and all is going well.. I must admit that this had me worried since I replaced both the full rocker panel and door jamb but all seemed to work out so to me this was a major hurdle...Since I live only 1.5 miles from Summit Racing I decide to go tire shopping and get that ball rolling, first I tried a 305/45R18 since I was going for the "pro Touring" look but the tires just didn't do it for me, so I switched to a 315/60R15 since that what HemiDenny is running and they look good on his car and since they have more of a street tread design but I cant find that tire anywhere I tried a mickey thompson ET drag...it was okay but I had over 1"+ on each side I wanted more tire so tried a Mickey thompson S/R 29 x 15-15 and was sold but there was one major issue. I only had 3/8" max clearance on each side(Frame/ Quarter) and I trimmed the quarter lip to 1/2"....so after heavy debate I have decided to cut out the frame rails and go with a direct fit set of 2" x 3" boxed rails and move them just inside the factory rails, giving me an extra 2.5"of space....so there will be major surgery coming once again for the rear of the car to include splitting the brand new tubbs.....of course this wont take place till the quarters are fully welded on. Oh yea also filled some more firewall holes...boring stuff compared to the rest. Enjoy and all the "are you crazy" comments are gladly welcomed and expected.