Bring it back 2 degrees per pound of boost and adjust it up from there. Detonation will scatter the pistons so don't go crazy. 12:1 is best for safe power.

Keep the carb to intake tract as short as possible. Be VERY careful with every connection and running ANY kind of boost gauge. You will be pushing a fat fuel/air mix through the gauge. If you get a vacuum leak (boost leak) then you will be blowing an explosive fuel/air mix through the leak. You don't need that fogging the exhaust manifold. Car go boom.
Remove any worm gear style hose clamps that will see boost. Replace them with higher strength T-bolt hose clamps.



A stock style 318 should live without a problem under that boost level. I'd think you could see around 300 rwhp max. Probably closer to 250. Either way, it'll wake up the car and make for some fun.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon