i baught a edelbrock preformer series intake manifold #3706 for cast iron heads 1987-1995 with EGR

do i need any other parts besides gaskets?

like brackets , spacers , clips anything of the nature?

Since no one else is responding to your post, I'll give it a shot...

If you look on Edelbrock's website (Edelbrock.com - Manifolds - Chevrolet - Small Block - Performer),
they do have some notes on which brackets they recommend...

Carburetor Recommendations: #2104: OEM 4-bbl. (pre-1981 only), use choke rod #9171, bracket #8031 or #8036 for 1972-78
Edelbrock Thunder Series AVS or Performer Series carb, 500-650 cfm (see Carbs & Accessories), use bracket #8031 or #8036 for 1972-78
#3706: OEM 4-bbl.
Edelbrock Performer Series #1400, 600 cfm (see Carbs & Accessories), use bracket #8031 or #8036 for 1972-78
Installation Notes: Use adapter #8035 for clamp-on EGR valve. With carb #1400 & #3706, EGR spacer #1476 is required. Choke plate #8901 included with #2104. #3706 has no provision for exhaust heated chokes. Recommended intake gasket: GM #10159409. Manifold height: A-3.50", B-4.60" see A/B Measurements. Port exit dimensions: 1.14" x 1.88".

You may want to goto the Summit or Jeg's website and see if the brackets look like what you already have.

If that doesn't work, I would call the free tech support at Summit or Jeg's and get their advice.

Hope this helps!

Best of luck