How much hp can the stock fuel pump support? I have a 89 305 TPI with 101,000 miles. A little worried about running out of fuel with a 100 shot of N20 or even the 60 shot i run now. My new mph should be around the 100mph mark after a cam swap and few other mods. So I figure ~275hp on motor plus 100 shot = fuel for 375+ hp? Also I bumped my fuel pressure up to ~51 psi. BLMs I saw were around 145-149 if that helps any.

Here's a chart to help you figure how much fuel pump you need. I do not know the GPH of a stock pump though.

http://www.lt1intake.com/engine_nitrous.htm

well, assuming 155 l/hr??(i think that's the smallest fuel pump ratings) gives me like 425hp. I guess I'll try it and check the plugs every now and then.

By any chance did you get a new time with your tranny fixed yet?

Yes, tranny is fixed. Fuel pump is shot now (inline). When the pump gets hot is shuts down.