carb bolt pattern question

[scottymizt]

I am planning on nitrous for the cuda and thequestion i have is when i order a system for it do i just get the one for a holley? Are the bolt patterns the same on all of the carbs? I know to some of you these are silly questions but i do try to find the answer before i ask. Thanks guys

 

[GoodysGotaCuda]

if its a little spacer setup with nozzles/jets then,

There are going to be square bore, and spread bore holleys.

Spread bore will have the huge secondaries, some holleys came this way, thermoquads, quadrajets

And some holleys came this way, edelbrocks, carters, this is square bore