crane coil 3 or 4 prong?

I have a crane hi-6s ignition with coil , and i bought a wiring harness from both rksport and summit racing, they both say that the harness is meant for gm lt1 cars with crane ignitions, but the wires are 3 prong. thats what my car is supposed to be i guess. however, the plug that i need to use is 4 prong, everyone says this is incorrect but neither of the harnesess will work. do i have the only 94 camaro z28 with a 4 prong coil?

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94 CamaroZ28 A4 quazar blue FIPK, vortech elboe , MAF , airfoil , crane hi-6s ignition , coil , flowmaster cat back exhaust, shift module, air temp module, 56k

Since this tech question is specific to the LT1, it should be posted on "LT1 Tech". I'll move it there for you.

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Fred
94 Formula A3+1: 381/TH400+OD/N2O

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11.513@115.59 on motor; 11.162@127.67, 1.643 60' on a 125-shot. Going with a 275-shot this year