thanks for everyones help, I got under and took some measurments and part numbers.
so here are some measurments and numbers.
Calipers have two hex hold downs, 3/8 hex, the
left caliper has P/N 18002328 with a 28 8L on it and a G286 on it
right has the same number
the rotor has
337226 with a 866 and a GM 68 on it
Lower Control Arm measurments
from center ball joint to the rear attach mount is 16 inches, the front mount to the ball joint is 18 inches
Upper Control arm rear bolt to upper ball joint is 12 inches
the center link is 17,5 from center of Pitman Arm to inner tie rod and 23 inches to the idler arm.
Frame is 26 inches wide at the front, its been cut so don't know if it gets wider in a area that's further forward
the Cross member has the lower control arm mounts 15 inches apart.
the spindles have 371676 13 and a 211 on them
the bleeder on the caliper is 3/8, the castle nuts on the ball joints are 3/4 and 7/8th and the upper CA bushing has 9/16ths