I'd put 20 to 30 miles on it let it cool over night and re torque the heads then maybe another 30 or so and maybe change the oil and filter too before the 60 mile ride....... you can check for little leaks and problems too so your close to home if something comes up on your new build.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....