1" Carb spacer

HVH 1" super sucker work best for me. I tried them all and optimized jetting each time.
340 10.3:1, Airgap deep port match, 750 proform dp, IMM Indy RHS X heads, 904 3200 tight converter, 4.10 Gear Vendor OD.
HVH Super Sucker Carburetor Spacers SS4150-1AL
i used a 2" one of those on my anglia gasser, they smooth the flow nicely from the carb base into the inlet.
neil.