Trying to finally get my first Muscle Car - I’m nervous

Thank you guys for all the advice! What would be the best place to get a loan for a classic car? Any suggestions?

Also, I was really set on getting one with a manual transmission, but someone on the forum has offered a really cool Plymouth Duster with an automatic transmission with a B&M shifter which I've never tried before. The pros of an automatic would mean I could let people I trust 100% take it for a spin (with me in the car of course haha). Most people I know don't drive manual. Besides, I'm having a hard time finding manual muscle cars for some reason. But people talk so much crap about the automatics I'm just not sure what to think.