how i did mine... i have a 4" drop front axle w/ 15" tires..
u need the bracket welded on the front end to bolt the hair pins to, equal distance top/bottom. measure to the center of axle on the ground with weight on it.(motor installed)
clamp a bracket to frame and a hole drilled to match the ctr of axle. the heim joints should be screwed in a equal distance in/out for adj when done.. when done do a square of rear axle and front axle.. also start with 1/8" toe in. make sure your steering box is adj'd properly for slack.. don't want death wobble at 50mph.. thats the ususal sp'd when u hit a bump and the front end goes out... its NOT fun.. bill