318 2 brl to 340 4 brl conversion Whats needed?

Hey guys, I am almost at the point where I will be dropping in a 1970 340 engine in my 69 Barracuda that was originally equipped with a 318 2 brl carb. My new setup will include a stock 1970 cast iron manifold and I plan to run a Holley 4 brl carb. Can anyone tell me what kind (exactly) of brackets or kickdown parts I may need so that I have all the parts before I tackle the job? I am sure alot of people here have been down this road and can lend some advice? Any other hurdles I may need to jump? Thanks!