The advertisement for the 1405 calls it a square bore carburetor, the picture looks like the primaries may be slightly smaller than the secondaries. If the carb is in good condition I would think you would be able to make it idle and run ok with a street cam, try the timing first.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy