you'll feel the difference, in off idle torque, if you swap, too a dual plane intake,
but I don,t think it would be worth the cost, for the minimal gains,
unless you install a high rise hood,
allowing a much better intake manifold design,
as the current lack of clearance makes any intake manifold that would fit currently,
under the low stock c3 corvette hood line, less than ideal.
there's zero question that a dual plane intake of the proper design will increase the lower rpm torque, but if you have to purchase that intake at the average price you may not see the valve per dollar spent.
or put differently, swapping to a decent cam, without a worn cam lobe,
would do a good deal more for that engines performance,
while the other engines being built,
and Id certainly rather select the cam if it was my corvette,
than buy and install one that may be cheap or even free,
if you don,t know the specs of the cam youll install,
and if its significantly different than the cam you have currently Id pass..
this is the 30 year old cam you have with the worn cam lobe
https://www.summitracing.com/parts/crn-10013/overview/
something similar to this would be rather similar to your current cam
but might provide a bit better lower rpm power with a restrictive stock exhaust.
ID want something no milder or lower in duration than this
http://www.pbm-erson.com/Catalog/Erson/Camshafts/Hydraulic Flat Tappet_E/ERSE110028
and no larger than this as a replacement cam used to repair the current engine
http://www.pbm-erson.com/Catalog/Erson/Camshafts/Hydraulic Flat Tappet_E/ERSE113321