Small roots blower for smallblock

I got a feeling your system will work fine for the mild combination you have. Run the pulley you have, install a boost gauge, keep the total timing at 28° to start with. Less timing if you're seeing over 5PSI.
Best of luck on your build.

I agree with Jack, try bumping up the timing, maybe to 26°
But I'd address the fuel issue first!
THAT LOOKS AWESOME!!!