10 PSI on an NA is totally reasonable. A light haze (as in LIGHT, like you don't see headlights disappear at night) will be totally safe. Throw $2 a day in a jar and in 2 months you'll have enough cash for a really good EGT gauge, then you can start having more fun.
I wouldn't hesitate to turn a K14 up to about 14 PSI without an intercooler or EGT gauge myself, but I also don't lose my job if my car isn't available. NA engines are cheap, people almost can't give them away. Perfect platform to learn and play on.