408 stroker cam recommendations

Cam's going to be really important if you plan on running heads that are somewhat of a cork or a big cork with no Port work... So with that said in order to make those heads kind of work decently "considering how much potential is in a 4" motor".. you're looking at some duration and probably a narrow LSA.
Can you handle spending on gears and convertor? Doesnt sound like it... So you should just focus on 'this' and be happy with the torque....whatever cam you have, it's about 10 degrees duration too small...hence 278 degrees would be the least amount to run in this particular case if you're asking me.
Even like rusty says... but I'd have one ground with about 8 to 10 degrees more duration.

Something like .520 lift 278dur 107 lsa
Check engle for off the shelf stuff, they're great 'go to' cams designed around your very heads 'stock iron' flow curve.