You're not crazy. There was a Spruce Goose with 8 .010s. Some of the guys in the group here have seen it.

I think you'd have more than enough power. I use 2oz tanks on most of my Norvel .061s.

I've seen plane started that had eight OS .46s. It took 3 guys; one on the TX, one on the glow ignitor, and one with the electric starter. The procedure was start an engine, set the needle, shut it off, start the next, set the needle... until they had been through all of the engines. Then they went back to the first one, started it, then the second etc.