The Vortec heads (assembled) are usually bring @$300~500 for the set when sold locally. This is for a good 'used' set, which includes those removed for upgrades with little to no actual use.
The Intakes go for @$100~150 - depends again on condition and accessories included with unit.
The Carb can be bundled with the above to increase price by $50~100 - but buyer may prefer a 'better' carb for his set-up.
Including other installation items can 'sweeten' the deal and bring a higher price from some buyers (but ... not usually me

).
The Cam to me, and many others, is worth about 'Zip' ...

I seldom am interested in a 'used' cam, no matter what the operating hours are represented as - even new.
This is not a particularly efficient grind, and there are many more desirable flat and roller cams I would be using in most builds before I would consider this type a contender.
My recommendation would be to 'bundle' the whole package as a 350/330HP Top End unit 'Complete' - and see if you can't get a decent price for the whole lot. People buying these type of parts are usually looking for a 'deal'

In that case I would ask @$500~650 and see if I get some bites.
As always - JMHO's