Holley Street Dominator 340 version???

Offy made some single plane divided intakes, like the early 60's cars had. Those were in both port sizes. Ebay and here is your only hope. The old eddy 340 torker has larger ports and the TM5 were larger yet--deeper.

Or the LD340 dual plane. Holley street dominator isn't bad and ports could be opened up a bit. Ports are small but short and no 90 bends, flows pretty well and the smaller ports speed up airflow for better low/mid range power. With the right cam it still be good for 6,500--maybe 7,000 rpm. I ran the holley, I liked it, really think it pulled better after 5,500 then the RPM intake. RPM did feel better from a stop but I didn't have a good converter back then. With a 3,000 stal converter the Holley would work great, imo, even with the small ports.

I run the small port dual quad D-64, D-66 intake(forget which one). Small ports don;t seem to hold the engine back, can hit 6,500 easily with 3.91 gears.