You find you'll have to check and double check everything you do to assure everything stays square...plumb and level.
After pulling angle dimensions on the frame at the new front sections to check square they were about 1/32" off. Not enough to worry about on a 64 13/16" length. Nice thing is if you ever have to use any of these points at the frame kick or the front to square something up they are dead on square.
I need to find a good supplier to source the leaf springs from...all of the ones that Speedway has have too long of a dimension from the locater pin to the front spring eye.