Find a engine dyno test of a 302 ford engine using the E303 camshaft. Look on the dyno test to see
the RPM point that peak engine torque occurs. Pick a stall speed that is 500-700 rpm belows that point.
so if peak torque occurs at 4000 rpm get a tork converter that creates a 3200-3500 real max stall speed when used on a 302CID motor.
The advertized stall speed may not be the real stall speed as the stall speed you are going to get is relative to engine torque input. A bigger 347 or 351 CID will see a higher stall than a 302 with the same torque converter.
Therfore is is very common to come up short on real stall speed behind small CID engines.
So before you buy the torque converter for your 302. CALL THE MANUFaCTURER.
They will advise you on the real stall speed you will get behind a 302 with any one converter.
That way you will get it right the first time.
A high stall converter is pretty tame when in a light weight car. So don;t be shy on stall.
You want the stall well up on the engine torque curve at launch.
302's need stiff gears too, especialy when cammed.
Th E303 cam is really intended for a 5 speed manual trans car. So when using with a auto transmission it may benefit from a bit of camshaft advance to build engine torque. More torque is better, with a auto transmission. Especially if the engine is a little soft on compression ratio. On a 302Ford its a real good idea to verify valve to piston clearance when ever messing the camshaft advance-retard phasing adjustment.
Again... if you want to get it right the first time call the converter manufacturer so you get the converter stall you need, from a off the shelf high stall converter. The phone call can make the difference between getting the right and wrong torque converter.