Best ifs kit? rms, hdk, gt suspension, or magnum force?

I recommend the same specs as others using the Mustang II front, however, some like to get a little more aggressive on the caster.

I live in flat NW Ohio....hardly any curves so I run closer to a drag set up with very little negative camber....both the same....negative 1/4 degree on each side

caster (mine is manual) 3.5 degrees positive
for power....up to 6 degrees positive (some are running this with manual and love it)

1/32" toe in

some like an extra 1/4 degree (camber) on the pass (right) side