[hevymetl]

So I'm thinking I need the rumble and power of a V8 in my 66 c10 long bed. Currently has 250 4spd on floor. What would be the easiest most economical engine swap I could do? Doing some research it looks like a small block will bolt right in. If I wanted to put a automatic in it as well, which one would be the best choice? It sees very limited highway use, mostly just around town cruises on nice days/nights.