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So on average what were the sonic check numbers#, how thick were the 2002 3/4 ton blocks as compared to the later ones?

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Off the top of head those early casting 5.7's were about .015" thicker all around then the newer 03 and up castings.

Looked up my 6,1 sonic check numbers here at home and averaged them out for you.

#1 thrust side = .198
#3 thrust side = .201
#5 thrust side = .203
#7 thrust side = .198

#2 thrust side = .179
#4 thrust side = .209
#6 thrust side = .203
#8 thrust side = .181

Between the cylinders were as high as .169 and as low as .114 with an overall average of .139. Non thrust sides averaged .180.