Thinking about upgrading my heads to a thicker deck. I love my 317's but just dnt trust the castings for the power the car is making now. I have a set of TFS 220's here but deck only measures .150'' thicker than the 317 heads. An increase in thickness but seems marginal vs the AFR advertised .750'' thick deck. The TFS head measures .540'' (sonic) deck thickness so the AFR if it measures as advertised would be over twice as thick as the factory deck. Have any of you measured the AFR deck? Sonic or close guess with caliper?