I have run my 1.70's and E cam for a year and a half now. I clayed the pistons and had over 1/4". I have Edelbrock performer 5.0's (6037). Ran good before the blower, even better with!
The 1.73's are also the measurement of the Crane Gold's. I have seen them and doubted the 1.73. They are stamped right on them. Friend has them. Nice looking.
Anyway, I ran a best of 13.27 @ 106 on street tires before the blower. Very streetable and passed emissions easily.
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See my car
HERE
93 GT Red/Grey
S trim, Edelbrock 6037 heads, E cam, BBK longtubes w/cats, 3 chamber Flowmasters, Cobra intake, Kirban fuel regulator, BBK 70mm t.b., 75mm Pro-M meter, 1.7 roller rockers, Mac upper and lower strut tower braces, FMS lowering springs, Factory Five upper and lower control arms, Speedware Cobra R 17X9 wheels, 3.73 gears & more.
DYNO=435.6 hp/405.1 tq at rear wheels.