I have the 4.30 put back in the car. I found the right upper control arm crossmember for the rear is torn loose from the frame 1.5 inches. Ouch. Will have to weld that back together at the shop. The new t10 with 2.88 first is in along with the puck clutch. I will be measuring for an Inland Empire rear shaft with the billet carrier bearing, and 1350 joints front to rear. I talked with a salesman and he said the rear shaft could be dropped down to 2.75 and leave the front shaft 3.0 without sacrificing a lot of strength. I am thinking since I have a 9 inch in the rear and the pinion is lower than the stock rear, if I went with a little smaller rear shaft it would give a little more room where the x frame comes close to the driveshaft. I don't have a real high ride height in the rear so that will also help. I also installed a permanent magnet starter from a late 90's 454 along with the G.M. bolts. I had to use 1 washer under each bolt so the bolts would not bottom out. They were probably .030 too long in stock form. It is tiny, and works fantastic. Finally making progress! Is there any thing else I should watch out for?