Looking to replace my 273 with a 318, which one?

Thanks guys! So far I'm looking at doing an ATK 360la from Classic Industries, with the 904 trans. I'd "rather" not horse around with sourcing a motor to rebuild and sending it off or redoing the 273, although I'm not 100% opposed to it either, I'd just rather bolt something in and go for now. I just want it to drive, then on to paint, interior, and suspension. Before this car gets crazy, which it WILL at some point, I want it to be a nice cruiser. I have other projects that have priority as far as engines and suspensions right now. This Barracuda's sat since around 1976, and needs a complete resto. I'd rather make it a nice cruiser for now and upgrade it later after other projects. I WOULD like it to at least beat my Uncles 78' "Lil Red Truck", which isn't impressive at all as far as performance. :D Decisions decisions, y'all make some good points! :banghead: