I have always heard that the frame should be cut on a 45 degree angle, not straight up and down. This allows the new joint to have a longer weld, which makes it stronger.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD