Upon doing some research I found that the casting # buicks.net has listed for a 4 barrel intake on a 364 is actually the gm part#. The actual casting# is 1173313. I verified this with the guys at CARS inc. I haven't checked but i believe the same thing is true of some of the other nailhead casting#s. Just giving a heads up to anyone who might need the info.:Smarty:
