s/s springs & front sus?

I apologize, I misread your question. the 1 5.8 suspension height is correct. Ive also seen bigblocks using the milodon using a motorplate using the 6 centerlink.check your ride height by parking on a level surface ,correct tire pressure.bounce the front end a few times to settle the suspension. measure the distance from 1 adjusting blade to the floor,and then measure the distance from the lowest point of the steering knuckle arm,at the centerline,on the same side to the the floor. the difference between measurements is the ride height. from side to side there should be no more than 1/4 difference. you are correct on the 1 5/8 number . fully extended with ss springs you should have minimum 28 inches fully extended . definitely buy the longer shocks as this is where your trouble lies. slant 6 t bar works great for a small block, small block t bar works great on a bb car for racing. Ive seen t bars on slant 6 cars on A bodies ,from the factory, that have thicker tbars then 340 original tbars in A bodies, buy the m.p ss extended shocks from jegs and problem solved, them ss springs will then plant like a gang of illegal mexicans, also use the m.p. adjustable snubber , auto car leave a 1/2 inch gap ,manual leave it to where rubber just touches pan ,you may have to cut the snubber rubber to get it right but by not using the snubber your winding the axle , also check your pinion angle, should be between 3 and 7 degrees ,I set mine at between 3 and 5 depending the combination, sorry, didnt mean to offend you friend, take care.....make adjustments by turning adjuster bolt near the top of the lower control arm,