Here's an angle to consider if you're torn between modifying your 305 or going with the crowd and ditching it in favor of a 350:
https://www.thirdgen.org/forums/orga...ml#post4079915

 

Nitrous is $3.50 a pound last I checked. If you don't have a bottle heater, you'll get 4 - 6 passes out of a fill, depending upon how big a shot you're spraying.

Low non-recurring cost, high recurring cost.

 

75 shot.
~800 psi yesterday (no heater).
N2O flow of .06 lb/sec x 14 sec/run = .84 lbs/run.
With the 15 lb bottle, that's an easy 12 runs.
For a car that will make 30 passes a year at most, this is by far the most economical way to let her get her kicks.

Obviously if you want the power for the street, this is not the way. I was just amazed at dropping almost 2 seconds from the car's best NA time.