I've not bought a wiring harness from any of them, to be upfront on this topic. But, at one time at least, M & H was supposedly willing to customize their harnesses to match the modifications to your car. Things such has switching from external to internal regulator alternator, points to HEI, a power lead for electric choke, extra "switched" power sources under the hood, etc.
Maybe all of them will offer such things now, or maybe none of them. But with a modified car, it might be something to inquire about.
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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