Too big of cam?

Whatever he means? He means that the /6 only gets so big and itis now about as big as they get as far as Chrysler 6's go. They allready have a 4 inch stroke crank and are limited in bore size.

Theres a bit you can do to it for more performance but just how far you want to go is up to you and how far from stock do you mind going?

Headers OK? 4bbl carb and intake? Newer better cam?

Without getting into the engine part, theres other ways you can help it. The forced induction is a nice idea but may require a rebuild all togther with fordged pistons ($$$)

Not much more expensive would be a overdrive tranny and change the gear ratio. What ever your rear gear is or will be, the overdrive ratio multiplied by the rear ratio will be the new ratio as a final drive. Heres an example;

3.91 rear gears times the O.D. ratio (.69) of an A-500 Chrysler trans equals

3.91 X .69 = 2.69
4.10 X .69 = 2.82
4.30 X .60 = 2.96

Dont sweat the ricer crowd. Your engine is very old in it's orgins. So old, it may be older than some of your school mates dad's. No joke. Old iron is much more difficult to get going fast much less faster than some new cars stock engines.