down draft 2bbl 500 cfm with custom nitrous plate

I had the same intake on my Z with a 290 CFM 4bbl carburetor. The L24 in mine had pushed considerably less cubic feet per minute than the Holley could deal with. So, I hope that's a bored and stroked L28, you got that strapped onto.

I replaced mine with a pair of 71' SU's. Engine is much happier now.

I recommend straighting out your spark plug wires and putting them on a loom. Crossed wires can jump sparks to the wrong cylinders. Very clean engine bay otherwise.