Nice setup. Just a point of clarification for anyone else with a 1990 who might read this. The Autolite 764 is the correct plug for the high output 351. This is the correct plug in this application because he modified his engine with GT40 heads. On a typical 1990, it would be a standard 351, for which the correct plug would be an Autolite 24 or its equivilent.
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.