Converter stall speed recommendations

Without cam specs and compression ratio, carb and intake, you are wasting your time and money trying to guess. The most important part of TC selection is cam. Thats why when you get a larger cam you need a higher stall converter. Cams start making torque based on duration, lift and LSA. If your converter stalls at 2000, and your 318 with "warm" 278 dur 488 lift doesnt start to make good torque until say 2800 for EXAMPLE, then the engine would bog badly when you tried to launch/accelerate hard. If your "warm" 318 has a 268 445 lift cam and you use a 3500 stall converter, it will narrow your power band to 3500-4500 because your 268 cam has a power band of EXAMPLE 1500-4500. Any power/torque below stall will be wasted as the converter will just eat power. If your "warm" 318 has a 268 cam and a small cabr like 600, then a 2000-2200 stall would be just great as your engine would only be 1000 rpm into best operating range and starting to make some good torque right at "lock up"(term not referencing an actual lock up converter of later years, but actually the point when converter starts to engage trans.

A TC is basically a hydraulically activated clutch that never fully engages, ie for example they slip around 20% so only 80% of engine speed in transferred into trans .

Legal disclaimer: numbers are for example and rough guess as I didnt look up cam torque specs, just off top of head.