I'm using the Zex system with a 75hp shot. It's a dry system...
If you haven't done any engine work, I would limit it to a 100 shot at most....
I've heard horror stories about our hyper-pathetic (pun intended) pistons and plastic intakes.
You also might want to think about investing in a timing adjuster too... especially if you go to larger shots in the future.
I still have yet to find someone who has an idea on a firm shot "level" that you really shouldn't go above with the stock timing. But detonation can be a scary thing, especially to an un-worked motor.
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1998 Mustang GT
13.97@103
"Traction Impaired" or "Nitto Needy"