Need some help

the 390 came with either a cruise-o-matic(pre 1966), a C6(post 1965), or a top loader 4spd. not sure about engine angles, but if you pick up a shop manual for your car, it will tell you what measurements you need to look for to tell if the engine compartment is square or not. if you can remove the rear seat, you should be able to get to the trunk lock. use a pair of needle nose pliers, and locate the lock itself. you will see the rod that operates the lock. turn this rod with the pliers and the trunk should pop open. then you can either replace, or repair the trunk lock. and dont let people who are jealous of your owning a vintage car get you down. invest some time and money on your car, assuming you like it enough to do so, and restore the car as you like. and tell the morons to bugger off.

390's also came with the Toploader 3 speeds too.

As to the appearance of the engine compartment, it would be a simple matter to compare yours with another similar car in good condition. A "bent" compartment would be best be deternined by such a comparison or measurements based on factory specs. See the Ford assembly manual.