I'm building a 383 small block and am debating installing some spray for the EXTREMELY occasional use. I want to know if my engine can handle a low horse shot and mainstain it's stability.
Also do I need a bigger carb than my 670cfm holley.
Engine Specs
-I'm ordering a forged stroker rotating assembly
http://shop.enginekits.com/osb/itemdetails.cfm?ID=2117
-A new GM 383 block
-Trick Flow aluminium 23 degree 2.02/1.60 195cc intake runner
-Edelbrock Performer RPM Airgap dual plane intake
- Trick flow cam Advertised Duration 284/290, Lift .480/.494
-1.5 trick flow rockers
-670 cfm Holley steet avenger
Tri-Y dougs headers

Thanks  

Your carb size is fine becacuse your cam reaches peak HP at 5700. That rpm range matches dual plane intake. A larger carb will cause a loss in torque (thus drivability).

It appears you are building a nice hot street motor. To run the small nitrous shot and have the moter stay together, here's is what I believe you'll need.
1. Make sur your using a good 4 bolt block and have it machined properly.
2. Make sure you're using main studs and not bolts.
3. Are your connecting rods bronze bushed for floating pin pistons? Many street motors fail while using nitrous because press-fit piston pins and rods are subject to galling at high torque loads. The floating pin setup allows pin oiling to prevent this from happening.

Coupled with the right gearing, this motor setup would give excellent performance for a variety of uses.
Good Luck