mechanical fuel system

[got6spd?]

I'm getting ready to build my fuel system for my 68 and was wondering what you guys thought of it.

I'm going to narrow my stock tank to accept my mini tubs and then weld on a comp engineering sump kit. Then 10 AN line is going to run to a 170 gph holley mechanical pump. Out of that the line will go into a Y-block then into two seperate 6 AN holley regulators (one to the carb and one to the nitrous).

Basically I was wondering if that was enough to support a 500 horse small block and an additional 150 shot of nitrous. I really didn't want to run an electric pump or that fairly expensive mechanical race pump if I didn't have to.

I hope that wasn't too confusing.