Single walbro should be enough for anything you want to throw at a 16g.
I would do a 2g head, the ports are smaller, but flow better from everyone I have talked to about heads. Shane and I had a talk about heads last summer when I brought a friend's car to get tuned. He had a stock 7 bolt longblock with an E316G, made 360HP and 320 torque I wanna say? He switched to a 2.3 stroker and a 1g head with a SMIM and lost power (made 347/361) on the same dyno with only those things changed. I asked Shane why he lost power with the bigger motor and SMIM, and he said it was most likely the head flow. PM Shane if you want more info I would say.
Other than that, the whole setup sounds like a good plan!!
Although, you might wanna pay Randyy before you dump to much money into this thing.
