need help. switching a holley to quadrajet carb

[yote1234]

i bought a gm new crate sp350/357 engine. it came with a 670 holley carb and i want to install a fresh rebuilt quadrajet 4 bbl carb off a 76-79 454. that i have sitting on my shelf. i was looking for a more simple install. and wanted more reliability. I also want to keep it all GM. All this is going into my fresh 1971 k5 blazer i am restoring.

Now for my question.....
Can anyone tell me the adapter plate i need to buy? the gm crate engine came with a gm intake to fit the holley carb. and again wanting to install my 1976 ish quadrajet carb. I Thank you,