If my car was going to be painted I would've sectioned the front of the opening and moved it forward at least one inch. it makes for a clean job and 99% of the people will never spot the change.
I was looking at my quarter panel last night trying to figure a layout because I could nearly get the same thing as a super stock opening just it would be factory looking & only have to make a couple fillers.
I hope it's not to hot this summer and I'll want to get into that