jetdocx, The '97 and '98 T595s are the same...mostly. Sometime earlier than my 1/98 built '98 there was a switch from a camshaft position sensor to a crankshaft position sensor. In '99 the ECM was upgraded along with throttle bodies, exhaust cam, primary tubes (clearance) and likely things I don't remember.
PS An engine swap may require a wiring harness andECM swap also.
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