Unfortunately searches here, "V8" is too short because I'm sure this question has been asked....

I know in Phoenix in the past that there are some number of 5.0 V8 Mustang convertibles, and I believe some V8 Camaro convertibles as well.

Will be in Los Angeles (Orange County) in a couple months with a free day and would like to rent a convertible for the day. However, I am not a huge fan of the more-common turbo 4cylinder Mustang.

Which agency (particularly at SNA) is most likely to have a V8 convertible on their lot? Or companies that I can guarantee that I will get a V8? It appears Sixt has Mustang GT (V8) guaranteed class, however, LAX is much farther away from me than SNA. Any guarantees around John Wayne Airport for a V8 convertible?