Very nice, Peter. It appears you've done an excellent job restoring your car as it should be done. I think you've priced it very fairly.
Did raising the vent opening 1/2 inch make an appreciable difference in under hood engine temp?
I've made many of the same modifications to my car as you've done to yours, but I've waited on changing the vent until I hear it's effective and worthwhile.
At present, my engine no longer overheats, and I'm 1/2 finished with installing Air Conditioning. Of course, A/C will add more heat underhood on the hottest days, so getting more airflow may become necessary as a result.