Definitely go 65mm. I've been told that the 19# injectors are fine up to 300 hp UNLESS you go with a NOS shot or jump to a blower. I can't find the articles but I've seen several that have a formula for figuring out what size injector you need. A fuel pressure regulator can also help improve the output of your 19# injectors though I wouldn't push it too far. I'm not going to change my injectors until I get my heads and intake. Just my $.02
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91 LX 5.0
Z t-5, 3:73 gear, Vortech 73mm Mass Air, Accufab 65mm TB, BBK underdrives, Crane HI-6S Ignition, BBK unequal length headers, Bassani x pipe, 2.5" Dynomax Super Turbo cat back, Kenny Brown Super Subs, Factory Five Control Arms, Mac cold air kit and more to come!
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