273 for 318 swap advice

I like the gear idea. What about 302 heads? I've been reading the site since I posted the thread. I really don't feel like building another engine. If a head swap and gears will wake up this thing, that suits me fine. Oh, the cam specs are 270 deg. advertised, 224 @ .050 and .468 lift in and out, cut on a 110 deg. lobe separation. I thought this would idle lumpy, but it sounds like a 340 and makes decent vacuum too, about 12 in/hg. This thing starts and runs great. It just aint fast or tire burnin' fun like I was hoping for. Aint mine though, it's my son's first car. I'm a big block guy. you can find me on FBBO as " 69 R/T". I will welcome any advice on making the "Moosemobile" faster.