My perfect...PERFECT...'66 Le Mans Sprint with 37K miles took eight months to sell at my price (high end price for a Sprint). If it had any V-8 it would have sold in a month or less for the same price. It was listed on CCTOL, the OHC forum, this site, PY, and CP.
I just sold a project Firebird within weeks of listing, again at my price. It was a non-numbers matching coupe and brought a fair amount.
Your price is definitely reasonable for a nice convertible. How original is it, what engine and trans, what options? This is the time of year to sell a 'vert, with the right listing in the right places you should get some action.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching